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hm digital logo   Oz Water Filters: a Official Australian Distributor
small arrow icon blk TM-1: Industrial-Grade Digital Thermometer
small arrow icon blk COM-100 Waterproof EC / TDS / Temp Combo Meter
small arrow icon blk PH-200 Waterproof pH Meter
small arrow icon blk EC3 (Electrical Conductivity Meter with temperature)
small arrow icon blk TDS-3 Meter with temperature

hm digital 02


Established in 1987, HM Digital, Inc. (formerly known as Heemang Electronics) is an original equipment manufacturer (OEM) that has been recognized worldwide for providing the best values in water testing instrumentation, especially the increasingly popular TDS meter.

hm digital 01HM Digital handheld and portable TDS, EC, pH and ORP testers, in-line monitors, controllers and accessories for reverse osmosis (RO) water filters, water purification systems, hydroponics, aquariums, pools and many other applications 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 monitors 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.