15 pcs pH Test Meter Measuring Pack Solution Buffer Powder pH Buffer 4.00/6.86/9.18 Calibration Point Sight for pH Meter Fast and Accurate Calibration of Water Purity pH

Useful for measuring depth, space or verifying the tiny details, gauges like callipers are widely used in auto mechanics. Reading an angle, checking the squareness and the geometric data or measuring a tree's circumference: here are all the measuring tools you will need to complete those tasks and more!