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
QC-1: Quick Check Monitor
Determine the quality of a water filtration system with the press of a button. The QC-1 features programmable set points, a TDS sensor and a green light and red light to indicate that the filter is good or requires service.
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Aquatech Amsterdam
Amsterdam, Netherlands | Sept. 30 - Oct. 3, 2008. Visit HM Digital's booth: 02.511B
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