The HM Digital HydroMaster continuously monitors pH, EC, and TDS temperature levels. The HM-500 is very accurate and can be calibrated with various buffer solutions, but also features automatic buffer recognition. The HydroMaster also features a rechargeable Lithium Ion battery which is strong enough to power the very bright LCD touch screen which has automatic light detection for low light situations.

Highly Accurate pH/EC/TDS Monitor. The HM-500 continuously monitors pH, EC, and TDS temperature levels.

Adjustable High & Low Alarm. The HM-500 features an adjustable high-low set point and on/off function.

LCD Touch-Type Screen with Auto Back Lighting. The HM-500 features a LCD touch screen which has automatic light detection and can be used in very dark places.

ABS Probes with Platinum Electrodes. The HM-500 ABS probes features 1/2" sensor probes and platinum electrodes.
Rechargeable Lithium Battery. The HM-500 includes a rechargeable lithium ion battery.