Laser levels, measuring and detection

3-in-1 endoscopic camera, underwater camera for industrial pipeline dredging, automotive maintenance probe, 1 meter - 5.5 mm (1/4)

3-in-1 endoscopic camera, underwater camera for industrial pipeline dredging, automotive maintenance probe, 1 meter - 5.5 mm (2/4)

3-in-1 endoscopic camera, underwater camera for industrial pipeline dredging, automotive maintenance probe, 1 meter - 5.5 mm

~~£44.15~~

Free shipping

Pack of 0-12mm digital thickness gauge, large LCD display, thickness gauge measures with high precision, measuring range: 0-12mm (battery not included). (1/5)

Pack of 0-12mm digital thickness gauge, large LCD display, thickness gauge measures with high precision, measuring range: 0-12mm (battery not included).

~~£24.86~~

Free shipping

Digital Battery Tester, Universal Battery Tester, Battery Tester, for AA, AAA, C, D, PP3, 9V, 1.5V, Button Cell Batteries - Works without Batteries (1/5)

Digital Battery Tester, Universal Battery Tester, Battery Tester, for AA, AAA, C, D, PP3, 9V, 1.5V, Button Cell Batteries - Works without Batteries (2/5)

Digital Battery Tester, Universal Battery Tester, Battery Tester, for AA, AAA, C, D, PP3, 9V, 1.5V, Button Cell Batteries - Works without Batteries (3/5)

Digital Battery Tester, Universal Battery Tester, Battery Tester, for AA, AAA, C, D, PP3, 9V, 1.5V, Button Cell Batteries - Works without Batteries

12-Line Green Self-Levelling Laser Level for Construction Site (1/5)

12-Line Green Self-Levelling Laser Level for Construction Site (2/5)

12-Line Green Self-Levelling Laser Level for Construction Site (3/5)

12-Line Green Self-Levelling Laser Level for Construction Site

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pH value test pen, portable pH tester, pH water quality tester (yellow) (1/4)

pH value test pen, portable pH tester, pH water quality tester (yellow) (2/4)

pH value test pen, portable pH tester, pH water quality tester (yellow)

[NEVER USED] Soil pH Meter, ST02 3-in-1 Soil Moisture pH Light Tester for Home, Garden, Lawn, Farm, Indoor and Outdoor Plants (Green) (1/4)

[NEVER USED] Soil pH Meter, ST02 3-in-1 Soil Moisture pH Light Tester for Home, Garden, Lawn, Farm, Indoor and Outdoor Plants (Green) (2/4)

[NEVER USED] Soil pH Meter, ST02 3-in-1 Soil Moisture pH Light Tester for Home, Garden, Lawn, Farm, Indoor and Outdoor Plants (Green)

Battery & Alternator Tester - L4300 (1/4)

Battery & Alternator Tester - L4300 (2/4)

Battery & Alternator Tester - L4300 (3/4)

Battery & Alternator Tester - L4300

Free shipping

Digital LCD Sound Level Meter, Backlit Display, Noise Decibels, Portable SPL Meter S8607 (1/5)

Digital LCD Sound Level Meter, Backlit Display, Noise Decibels, Portable SPL Meter S8607 (2/5)

Digital LCD Sound Level Meter, Backlit Display, Noise Decibels, Portable SPL Meter S8607 (3/5)

Digital LCD Sound Level Meter, Backlit Display, Noise Decibels, Portable SPL Meter S8607

~~£31.99~~

Free shipping

Test Clip Chip Meter for Capacitors with Resistance Multimeter, Capacitor Clamp (1/5)

Test Clip Chip Meter for Capacitors with Resistance Multimeter, Capacitor Clamp (2/5)

Test Clip Chip Meter for Capacitors with Resistance Multimeter, Capacitor Clamp (3/5)

Test Clip Chip Meter for Capacitors with Resistance Multimeter, Capacitor Clamp

~~£21.99~~

Free shipping

5-in-1 Smart Digital Battery Meter, Battery Capacity Checker with LCD Screen (1/5)

5-in-1 Smart Digital Battery Meter, Battery Capacity Checker with LCD Screen (2/5)

5-in-1 Smart Digital Battery Meter, Battery Capacity Checker with LCD Screen (3/5)

5-in-1 Smart Digital Battery Meter, Battery Capacity Checker with LCD Screen

~~£21.99~~

Free shipping

Draper 32149 Laserliner 080.981E DistanceMaster 40 Laser Distance Measurer (1/2)

Draper 32149 Laserliner 080.981E DistanceMaster 40 Laser Distance Measurer

Free shipping

5m 3 in 1 Type-C USB Inspection Camera 6 Adjustable LED Lights Inspection Camera (1/4)

5m 3 in 1 Type-C USB Inspection Camera 6 Adjustable LED Lights Inspection Camera (2/4)

5m 3 in 1 Type-C USB Inspection Camera 6 Adjustable LED Lights Inspection Camera

~~£33.28~~

Free shipping

Electrical Tester, Non-Contact Voltage Detector 12-1000V, Live/Neutral Wire Test, Audible & Visual Buzzer, Flashlight, AC 50-500Hz, NCV Voltage Tester Pen (1/5)

Electrical Tester, Non-Contact Voltage Detector 12-1000V, Live/Neutral Wire Test, Audible & Visual Buzzer, Flashlight, AC 50-500Hz, NCV Voltage Tester Pen

Noise meter Digital Sound Level Meter Noise Tester 30-130dB LCD Display in Noise Decibel (1/4)

Noise meter Digital Sound Level Meter Noise Tester 30-130dB LCD Display in Noise Decibel (2/4)

Noise meter Digital Sound Level Meter Noise Tester 30-130dB LCD Display in Noise Decibel

2 Pack Thermometre Interieur MiniThermomètre Hygrometre Haute Précision Température Hygromètre Moniteur avec Air icône Confortable pour Cuisine Chambre de Bébé Serre Entrepôt Bureau, OUYLAF (1/4)

2 Pack Thermometre Interieur MiniThermomètre Hygrometre Haute Précision Température Hygromètre Moniteur avec Air icône Confortable pour Cuisine Chambre de Bébé Serre Entrepôt Bureau, OUYLAF

Digital Fiber Optic Power Meter, Optical Cable Tester, Measuring Range -70+10dBm (1/5)

Digital Fiber Optic Power Meter, Optical Cable Tester, Measuring Range -70+10dBm (2/5)

Digital Fiber Optic Power Meter, Optical Cable Tester, Measuring Range -70+10dBm (3/5)

Digital Fiber Optic Power Meter, Optical Cable Tester, Measuring Range -70+10dBm (4/5)

Digital Fiber Optic Power Meter, Optical Cable Tester, Measuring Range -70+10dBm

Free shipping

in 1 Voltage Tester Tool - Electrical Tester AC DC 6-380V (1/4)

in 1 Voltage Tester Tool - Electrical Tester AC DC 6-380V (2/4)

in 1 Voltage Tester Tool - Electrical Tester AC DC 6-380V (3/4)

in 1 Voltage Tester Tool - Electrical Tester AC DC 6-380V

~~£21.04~~

Free shipping

Mini High-Precision Digital Indoor Thermometer Hygrometer, Temperature and Humidity Monitor, Thermo-Hygrometer Consumption Level Indicator (1/5)

Mini High-Precision Digital Indoor Thermometer Hygrometer, Temperature and Humidity Monitor, Thermo-Hygrometer Consumption Level Indicator

~~£20.99~~

Free shipping

3X Refrigerator Thermometer, Digital Freezer Thermometer, Refrigerator/Bedroom Thermometer, Waterproof Freezer Thermometer with LCD Screen (1/4)

3X Refrigerator Thermometer, Digital Freezer Thermometer, Refrigerator/Bedroom Thermometer, Waterproof Freezer Thermometer with LCD Screen

~~£41.55~~

Free shipping

Earth wire tester for socket tester, socket phase (EU regulation HT107D) aiperq (1/4)

Earth wire tester for socket tester, socket phase (EU regulation HT107D) aiperq (2/4)

Earth wire tester for socket tester, socket phase (EU regulation HT107D) aiperq

Garden Soil Temperature Thermometer, 125mm Stainless Steel Soil Temperature Meter Gardening Accessories Compost Thermometer for Potting Gardening Planting (1/5)

Garden Soil Temperature Thermometer, 125mm Stainless Steel Soil Temperature Meter Gardening Accessories Compost Thermometer for Potting Gardening Planting

~~£30.35~~

Free shipping

Sound Level Meter 30-130dBA, Professional Decibel Meter With Backlit Display (1/5)

Sound Level Meter 30-130dBA, Professional Decibel Meter With Backlit Display (2/5)

Sound Level Meter 30-130dBA, Professional Decibel Meter With Backlit Display (3/5)

Sound Level Meter 30-130dBA, Professional Decibel Meter With Backlit Display (4/5)

Sound Level Meter 30-130dBA, Professional Decibel Meter With Backlit Display

~~£35.63~~

Free shipping

$Beekeepers' Refractometer for Honey (58-90% Brix, 10-33% wet water content), Sugar (to determine sugar content), Vegetable Oil, Syrup, Molasses (1/4)$ $Beekeepers' Refractometer for Honey (58-90% Brix, 10-33% wet water content), Sugar (to determine sugar content), Vegetable Oil, Syrup, Molasses (2/4)$ $Beekeepers' Refractometer for Honey (58-90% Brix, 10-33% wet water content), Sugar (to determine sugar content), Vegetable Oil, Syrup, Molasses (3/4)$ $Beekeepers' Refractometer for Honey (58-90% Brix, 10-33% wet water content), Sugar (to determine sugar content), Vegetable Oil, Syrup, Molasses (4/4)$

Beekeepers' Refractometer for Honey (58-90% Brix, 10-33% wet water content), Sugar (to determine sugar content), Vegetable Oil, Syrup, Molasses

~~£73.24~~

Free shipping

3-in-1 Soil Tester Meter for Moisture, Light, and pH, for Plant Soil, Ideal for Garden, Farm, Lawn, Indoor and Outdoor Use (No Battery Required) (1/5)

3-in-1 Soil Tester Meter for Moisture, Light, and pH, for Plant Soil, Ideal for Garden, Farm, Lawn, Indoor and Outdoor Use (No Battery Required) (2/5)

3-in-1 Soil Tester Meter for Moisture, Light, and pH, for Plant Soil, Ideal for Garden, Farm, Lawn, Indoor and Outdoor Use (No Battery Required) (3/5)

3-in-1 Soil Tester Meter for Moisture, Light, and pH, for Plant Soil, Ideal for Garden, Farm, Lawn, Indoor and Outdoor Use (No Battery Required) (4/5)

3-in-1 Soil Tester Meter for Moisture, Light, and pH, for Plant Soil, Ideal for Garden, Farm, Lawn, Indoor and Outdoor Use (No Battery Required)

Free shipping

Tachymètre de compteur horaire numérique rappel de maintenance, batterie remplaçable, arrêt automatique, utilisation pour tondeuse à gazon ZTR Générateur de tracteur Marine VTT Motoneige et équipemen (1/5)

Tachymètre de compteur horaire numérique rappel de maintenance, batterie remplaçable, arrêt automatique, utilisation pour tondeuse à gazon ZTR Générateur de tracteur Marine VTT Motoneige et équipemen

Free shipping

Set of 2 digital temperature and humidity sensors compatible with Arduino and Raspberry Pi (1/4)

Set of 2 digital temperature and humidity sensors compatible with Arduino and Raspberry Pi (2/4)

Set of 2 digital temperature and humidity sensors compatible with Arduino and Raspberry Pi (3/4)

Set of 2 digital temperature and humidity sensors compatible with Arduino and Raspberry Pi

Free shipping

Digital multimeter, ST180 4000 count digital clamp meter, AC current multimeter, red (without battery) (1/4)

Digital multimeter, ST180 4000 count digital clamp meter, AC current multimeter, red (without battery) (2/4)

Digital multimeter, ST180 4000 count digital clamp meter, AC current multimeter, red (without battery)

Automatic Digital Multimeter – Smart Auto Mode – Non-Contact Voltage Detection – Overload Protection – Backlit Display – HT123 (1/5)

Automatic Digital Multimeter – Smart Auto Mode – Non-Contact Voltage Detection – Overload Protection – Backlit Display – HT123 (2/5)

Automatic Digital Multimeter – Smart Auto Mode – Non-Contact Voltage Detection – Overload Protection – Backlit Display – HT123 (3/5)

Automatic Digital Multimeter – Smart Auto Mode – Non-Contact Voltage Detection – Overload Protection – Backlit Display – HT123

4 in 1 Multi-Function Stud Finder with HD LCD Display, Wall Scanner for Metal, Pipe, Wood, Power Line, AC Voltage Detector (1/5)

4 in 1 Multi-Function Stud Finder with HD LCD Display, Wall Scanner for Metal, Pipe, Wood, Power Line, AC Voltage Detector (2/5)

4 in 1 Multi-Function Stud Finder with HD LCD Display, Wall Scanner for Metal, Pipe, Wood, Power Line, AC Voltage Detector (3/5)

4 in 1 Multi-Function Stud Finder with HD LCD Display, Wall Scanner for Metal, Pipe, Wood, Power Line, AC Voltage Detector (4/5)

4 in 1 Multi-Function Stud Finder with HD LCD Display, Wall Scanner for Metal, Pipe, Wood, Power Line, AC Voltage Detector

~~£38.86~~

Free shipping

This four-in-one soil testing device can measure soil pH, solar radiation intensity, moisture, and temperature. (1/5)

This four-in-one soil testing device can measure soil pH, solar radiation intensity, moisture, and temperature. (2/5)

This four-in-one soil testing device can measure soil pH, solar radiation intensity, moisture, and temperature. (3/5)

This four-in-one soil testing device can measure soil pH, solar radiation intensity, moisture, and temperature.

Free shipping

Testeur de Sol pH d'humidité Température Lumineuse 4 en 1 pH Metre de Sol Humidité Testeur Terre Electronique pour Jardin Plantes Triomphe （Jaune） (1/5)

Testeur de Sol pH d'humidité Température Lumineuse 4 en 1 pH Metre de Sol Humidité Testeur Terre Electronique pour Jardin Plantes Triomphe （Jaune）

Professional sound level meter 30-130 dBA - decibel meter with backlit display (battery included) (1/5)

Professional sound level meter 30-130 dBA - decibel meter with backlit display (battery included) (2/5)

Professional sound level meter 30-130 dBA - decibel meter with backlit display (battery included) (3/5)

Professional sound level meter 30-130 dBA - decibel meter with backlit display (battery included) (4/5)

Professional sound level meter 30-130 dBA - decibel meter with backlit display (battery included)

Pack Mini Indoor Thermometer Hygrometer High Precision Temperature Hygrometer Monitor with Air Icon Comfortable for Kitchen Baby Room Greenhouse Warehouse Office, TRIMEC (1/4)

Pack Mini Indoor Thermometer Hygrometer High Precision Temperature Hygrometer Monitor with Air Icon Comfortable for Kitchen Baby Room Greenhouse Warehouse Office, TRIMEC

~~£36.69~~

Free shipping

noir-Stylo Testeur de Tension, Stylo de Test Électrique 6V 24V Testeur de Circuit Stylo de Test Électrique Tension éLectrique Stylo Test ÉLectrique Automatique Courant Continu Tournevis Machines (1/4)

noir-Stylo Testeur de Tension, Stylo de Test Électrique 6V 24V Testeur de Circuit Stylo de Test Électrique Tension éLectrique Stylo Test ÉLectrique Automatique Courant Continu Tournevis Machines

Free shipping

[NEVER USED] High-Precision Digital Indoor Thermometer Hygrometer, Temperature and Humidity Monitor, Thermo Hygrometer Comfort Level Indicator (1/4)

[NEVER USED] High-Precision Digital Indoor Thermometer Hygrometer, Temperature and Humidity Monitor, Thermo Hygrometer Comfort Level Indicator

[NEVER USED] Mini white digital thermometer and hygrometer for monitoring indoor temperature and humidity - Fahrenheit (℉) display (1/4)

[NEVER USED] Mini white digital thermometer and hygrometer for monitoring indoor temperature and humidity - Fahrenheit (℉) display (2/4)

[NEVER USED] Mini white digital thermometer and hygrometer for monitoring indoor temperature and humidity - Fahrenheit (℉) display

[NEVER USED] Mini black digital thermometer and hygrometer for monitoring indoor temperature and humidity - Fahrenheit (℉) display (1/4)

[NEVER USED] Mini black digital thermometer and hygrometer for monitoring indoor temperature and humidity - Fahrenheit (℉) display (2/4)

[NEVER USED] Mini black digital thermometer and hygrometer for monitoring indoor temperature and humidity - Fahrenheit (℉) display

Thickness Gauge 0-12.7mm Digital Gauge High Precision Measurement Tester LCD Display (1/5)

Thickness Gauge 0-12.7mm Digital Gauge High Precision Measurement Tester LCD Display (2/5)

Thickness Gauge 0-12.7mm Digital Gauge High Precision Measurement Tester LCD Display (3/5)

Thickness Gauge 0-12.7mm Digital Gauge High Precision Measurement Tester LCD Display (4/5)

Thickness Gauge 0-12.7mm Digital Gauge High Precision Measurement Tester LCD Display

Free shipping

Electronic pH meter for aquariums – ABS pH probe 0–14 pH, high sensitivity, high accuracy, precise and reliable industrial power supply (1/5)

Electronic pH meter for aquariums – ABS pH probe 0–14 pH, high sensitivity, high accuracy, precise and reliable industrial power supply (2/5)

Electronic pH meter for aquariums – ABS pH probe 0–14 pH, high sensitivity, high accuracy, precise and reliable industrial power supply (3/5)

Electronic pH meter for aquariums – ABS pH probe 0–14 pH, high sensitivity, high accuracy, precise and reliable industrial power supply

Handheld Digital Anemometer with LCD Display Wind Speed Gauge with Digital Thermometer Air Velocity and Wind Speed Meter Measuring Tool for Windsurfing Surfing Kite Flying Fishing Hiking and Other Out (1/5)

Handheld Digital Anemometer with LCD Display Wind Speed Gauge with Digital Thermometer Air Velocity and Wind Speed Meter Measuring Tool for Windsurfing Surfing Kite Flying Fishing Hiking and Other Out

Digital Clamp Multimeter Handheld Voltage Tester With Integrated (1/5)

Digital Clamp Multimeter Handheld Voltage Tester With Integrated (2/5)

Digital Clamp Multimeter Handheld Voltage Tester With Integrated (3/5)

Digital Clamp Multimeter Handheld Voltage Tester With Integrated

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Smart Pen Type Multimeter Voltmeter Electric Digital Voltage (1/5)

Smart Pen Type Multimeter Voltmeter Electric Digital Voltage (2/5)

Smart Pen Type Multimeter Voltmeter Electric Digital Voltage (3/5)

Smart Pen Type Multimeter Voltmeter Electric Digital Voltage

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[NEVER USED] 40m Laser Rangefinder – Accuracy ± 3 mm – ABS and silicone casing – Backlight – Area and volume measurement (1/4)

[NEVER USED] 40m Laser Rangefinder – Accuracy ± 3 mm – ABS and silicone casing – Backlight – Area and volume measurement (2/4)

[NEVER USED] 40m Laser Rangefinder – Accuracy ± 3 mm – ABS and silicone casing – Backlight – Area and volume measurement

Free shipping

Laser Rangefinder Waterproof and Dustproof Laser Rangefinder Infrared Distance Meter ABS Material, for Construction and Industry (1/5)

Laser Rangefinder Waterproof and Dustproof Laser Rangefinder Infrared Distance Meter ABS Material, for Construction and Industry (2/5)

Laser Rangefinder Waterproof and Dustproof Laser Rangefinder Infrared Distance Meter ABS Material, for Construction and Industry (3/5)

Laser Rangefinder Waterproof and Dustproof Laser Rangefinder Infrared Distance Meter ABS Material, for Construction and Industry (4/5)

Laser Rangefinder Waterproof and Dustproof Laser Rangefinder Infrared Distance Meter ABS Material, for Construction and Industry

~~£45.34~~

Free shipping

CSPARKV （12×10×0.6cm）Durable Iron Magnetic Wall Mount Magnetic Adsorption Universal L-Shaped Laser Level Tripod Adapter Magnetic Adsorption Bracket (1/4)

CSPARKV （12×10×0.6cm）Durable Iron Magnetic Wall Mount Magnetic Adsorption Universal L-Shaped Laser Level Tripod Adapter Magnetic Adsorption Bracket

~~£28.49~~

Free shipping

PH Meter Tester, Soil PH Meter Test Kits for Cultivated Plants Flowers Vegetables No Batteries Required for Garden, Lawn, Farm, Indoor and Outdoor Use (1/4)

PH Meter Tester, Soil PH Meter Test Kits for Cultivated Plants Flowers Vegetables No Batteries Required for Garden, Lawn, Farm, Indoor and Outdoor Use

~~£41.72~~

Free shipping

9.99 m rangefinder, portable rangefinder with electronic ruler, portable digital rangefinder, electronic measuring tape, electronic measuring tape, measuring tape and measuring tool (1/5)

9.99 m rangefinder, portable rangefinder with electronic ruler, portable digital rangefinder, electronic measuring tape, electronic measuring tape, measuring tape and measuring tool

Bosch Tripod MM 2 Carton box 0603692203 (1/4)

Bosch Tripod MM 2 Carton box 0603692203 (2/4)

Bosch Tripod MM 2 Carton box 0603692203 (3/4)

Bosch Tripod MM 2 Carton box 0603692203

Free shipping

Mini thermometer hygrometer, built-in LCD digital humidity meter gauge monitor with external probe for incubators, brooders, reptile tanks, aquariums, reservoirs (1/4)

Mini thermometer hygrometer, built-in LCD digital humidity meter gauge monitor with external probe for incubators, brooders, reptile tanks, aquariums, reservoirs

Set of 2 mini white digital thermometers and hygrometers, LCD display, for indoor temperature and humidity, for living room, kitchen, baby's room (1/4)

Set of 2 mini white digital thermometers and hygrometers, LCD display, for indoor temperature and humidity, for living room, kitchen, baby's room (2/4)

Set of 2 mini white digital thermometers and hygrometers, LCD display, for indoor temperature and humidity, for living room, kitchen, baby's room

4. Room Thermometer, Mini LCD Digital Hygrometer, Easy-to-Use Indoor Thermometer, Multifunctional Humidity Thermometer (1/4)

4. Room Thermometer, Mini LCD Digital Hygrometer, Easy-to-Use Indoor Thermometer, Multifunctional Humidity Thermometer (2/4)

4. Room Thermometer, Mini LCD Digital Hygrometer, Easy-to-Use Indoor Thermometer, Multifunctional Humidity Thermometer

Waterproof Digital LCD Thermometer -50℃ to 110℃ - 100cm Probe - For Refrigerator, Freezer, Aquarium, and Home Use (1/5)

Waterproof Digital LCD Thermometer -50℃ to 110℃ - 100cm Probe - For Refrigerator, Freezer, Aquarium, and Home Use (2/5)

Waterproof Digital LCD Thermometer -50℃ to 110℃ - 100cm Probe - For Refrigerator, Freezer, Aquarium, and Home Use (3/5)

Waterproof Digital LCD Thermometer -50℃ to 110℃ - 100cm Probe - For Refrigerator, Freezer, Aquarium, and Home Use (4/5)

Waterproof Digital LCD Thermometer -50℃ to 110℃ - 100cm Probe - For Refrigerator, Freezer, Aquarium, and Home Use

~~£19.87~~

Soil pH meter – 2-in-1 soil pH tester, high-precision pH tester for fertile soils, suitable for garden plants and flowers (1/5)

Soil pH meter – 2-in-1 soil pH tester, high-precision pH tester for fertile soils, suitable for garden plants and flowers (2/5)

Soil pH meter – 2-in-1 soil pH tester, high-precision pH tester for fertile soils, suitable for garden plants and flowers (3/5)

Soil pH meter – 2-in-1 soil pH tester, high-precision pH tester for fertile soils, suitable for garden plants and flowers

Digital pH meter, high-precision pen-shaped pH measuring device (0.01 pH) for hydroponics, home beverage production and swimming pools. (1/5)

Digital pH meter, high-precision pen-shaped pH measuring device (0.01 pH) for hydroponics, home beverage production and swimming pools. (2/5)

Digital pH meter, high-precision pen-shaped pH measuring device (0.01 pH) for hydroponics, home beverage production and swimming pools. (3/5)

Digital pH meter, high-precision pen-shaped pH measuring device (0.01 pH) for hydroponics, home beverage production and swimming pools.

Digital pH Meter for Food: Accurate pH Tester for Water, Cheese, Sourdough, Preserves, Meat, and Solid Samples Portable pH Tester for Aquariums and Applications (1/4)

Digital pH Meter for Food: Accurate pH Tester for Water, Cheese, Sourdough, Preserves, Meat, and Solid Samples Portable pH Tester for Aquariums and Applications