HM Digital Replacement Sensor for COM-100

The HM Digital Replacement Sensor for ORP-200 is designed to restore and enhance the performance of your ORP-200 meter. This high-quality replacement sensor ensures accurate and reliable measurement...

Replacement probe for PH-200: Waterproof pH Meter for Measures pH and Temperature.

Brand New! The COM-80 is a reliable, economically priced, EC/TDS meter that is perfect for testing applications like hydroponics, gardening, pools, spas, aquariums, reef tanks, water ionizers,...

HM Digital COM-300: Waterproof Professional Series pH/EC/TDS/Temp Meter The COM-300 is a professional grade level pH/EC/TDS/Temp meter ideal for all water quality testing, hydroponics, water

Ideal for all pH testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing,...