Welcome to your premier source for the finest quality water testing instrumentation.
Our handheld and portable TDS, EC and pH 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. is 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 products to learn more about which TDS tester is right for you.
What is a TDS meter and what is TDS (Total Dissolved Solids)?
Product Highlight | Upcoming Events
AP-1: AquaPro Water Quality Tester
HM Digital introduces its new AquaPro series, a line of handheld TDS/EC meters with a sleek design that is perfect for the modern kitchen. The AquaPro digital water testers are the next generation for today's tech-savvy and health-conscience consumer.
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FM-1: Filter Monitor
The new Filter Monitor is an innovative inline combination timer and volumizer. The battery-powered FM-1 has five timers for a 5-stage system, as well as a water volumizer and programmable set-points and alarms for each function, all in a crisp, attractive housing. With an optional flow switch and faucet indicator light disc, this unit is a must with or without a TDS monitor.
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