Feature: The test pen uses a large screen display with backlight, more clearer to read data. Three-in-one, water pH, conductivity, temperature, three test functions are integrated. With automatic temperature compensation, the test value is more accurate. The test pen has an automatic shutdown function, so you don't have to worry about accidentally running out of power. This product is widely used in the testing of various types of water, household drinking water, swimming pools, rivers, ponds, etc. Specification: EZ9902 Range pH: 0.00 to 14.00 pH; EC: 1 to 19999us/cm; TEMP: 0 to 60.0°C/32.0 to 140.0°F Resolution PH: 0.01pH; EC: 1μs/cm Accuracy(@25℃; /77°F ) pH : ±0.05pH; TEMP: ±0.5°C EC:±2% Calibration pH 6.86 point: Accuracy ±0.1pH 6.86/4.00(6.86/9.18) points: Accuracy ±0.05pH 6.86/4.00/9.18 points: Accuracy ±0.02pH EC Calibrated by factory (1413μ s/cm ) Temp Compensation Automatic temperature compensation (0-60°C) Battery/Auto power-off 3*1.5V Button cell(No-include ) Auto power-off : 5 Minutes Low power protection system / battery indicator Environment 0 to 60.0°C(32.0 to 140.0°F); RH 100% Dimensions/Weight 183*37*37mm(7.2*1.5*1.5in ) Package list: 1 * Water Digital Pen Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .