15-piece pH tester set, batch number measurement, buffer solution, pH powder (4.00/6.86/9.18), calibration point, pH meter sight glass

General Description
The pH tester calibration powder solution offers high accuracy of ±0.01 pH, ideal for calibrating most pH meters. Each sachet is carefully sealed to ensure optimal quality and resistance to moisture.

Technical Specifications
Accuracy: ±0.01 pH at 25°C (77°F)
Pack of 15: 5 sachets of pH 4.00, 5 sachets of pH 6.86, 5 sachets of pH 9.18
Compatibility and Accessories
Compatible with most pH meters.

Installation
Empty the powder completely into a dry glass container.
Add 250 mL of deionized (or distilled) water to the beaker.
Stir until the powder is completely dissolved.
Immerse the pH meter in the solution, stir gently, and wait a few seconds for the result.
Use
Use the solution to calibrate your pH meter. Caution: The solution is not potable.

The pH meter must be recalibrated in the following cases:

Prolonged inactivity (more than 3-4 weeks).
Frequent use.
Unstable pH meter reading.
After testing with strong acids.
High accuracy requirements.