HM Digital, Inc.
COM-80 EC/TDS Hydrotester
The COM-80 is an economically priced, reliable EC/TDS meter that is ideal for testing applications such as hydroponics.
HM Digital PH-80 Water Resistant Meter
The HM Digital PH-80 pH Meter is an economically priced, reliable pH meter that is ideal for testing in hydroponic and aquaculture applications
TDS-4TM Pocket TDS Temp Meter
The HM Digital TDS-4TM Pocket Size TDS & Temp Meter is ideal for fresh water aquariums, swimming pools, spas, and hydroponics.
TDS-EZ Consumer TDS Meter
The HM Digital TDS-EZ Consumer TDS Meter is Ideal for all basic water testing applications. The best value meter in the world!