Tested to NSF/ANSI-42 & 53 standards

and calibration buffers

0 Neutral Standard: Precise neutral point calibration for accurate pH measurements

Measurement Range: 0

HM Digital HM-500 HydroMaster pH EC TDS Temperature Monitor - Rechargeable Continuous Tester water purification tester Tested to NSF/ANSI-42 & 53HM 500 HydroMaster: EC TDS, pH, Temp Continuous Monitor The HM 500 is the most versatile continuous monitor indicating EC TDS, pH, and Temp providing accurate, stable readings the user can rely on. With its rechargeable battery this unit is portable or can be wall mounted.. To make is even more user friendly, it comes equipped with touch screen, high and low alarm set points, and recorded readings. It is ideal for hydroponics and other applications