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 Basic TDS Tester
 TDS Meter 3
 TDS Meter 4
 TDS Meter 4TM
 EC/TDS Combo Meter
 Waterproof pH Meter
 Waterproof ORP Meter
 TDS-EZ Water Quality
 AP-1: AquaPro (TDS)
 AP-2: AquaPro (EC)
 Conductivity Tester
 Water Quality Tester
 Dual TDS Monitor
 Dual TDS Monitor 2
 Clean Tap Monitor
 Purity Monitor
 External Purity Monitor
 FM-1: Filter Monitor
 FM-2: Filter Monitor
 PSC-150:TDS Controller
 QC-1:TDS Monitor
 In-Line Single Monitor
 Panel Mount Controller
 Dual TDS Controller
 Dual Display Controller
 Conductivity Controller
Injection Controller
TDS/EC Controller
 Precipitator 1
 Precipitator 2
 Calibration Solutions

Welcome to your UK source for the finest quality water testing instrumentation.

Our handheld TDS testers, in-line monitors, controllers and demonstration devices for reverse osmosis (RO) water filters and water purification systems are superior in construction and performance, yet made available at a very economic cost. HM Digital, Inc. are the only manufacturer of economical in-line dual TDS meters that measure total dissolved solids (TDS) levels of feed and product water lines simultaneously, an effective way to compare rejection rates and gauge reverse osmosis membrane, water filter and water purification performance.

With HM Digital water testing instruments, you'll know if your water is pure.

Please click on products to learn more about which TDS tester is right for you.

What is a TDS meter and what is TDS (Total Dissolved Solids)?


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