HM Digital, Inc. products

The TDS-4TM handheld meter is ideal for testing TDS and salt levels of freshwater aquariums and ponds. It can also be used for testing water filtration and purification systems, such as RO and DI, to know when to change filters and membranes.

The ZT-2 is the perfect low-cost meter that can be used as a promotional item or giveaway with the purchase of another product. This low cost does not sacrifice quality.

The #1 selling handheld TDS meter in the world! This economically priced meter offers unparalleled value and quality. Its attractive housing and retail-ready packing make it an ideal low-cost meter.

The TDS-4 is an ideal pocket meter that can be used for any and all applications, ranging from water purification to hydroponics, to aquariums, to industrial wastewater treatment.

With its rugged design and build, the TDS-3 is an ideal meter (tool) that can be used for any application; Ranging from water purification to hydroponics to industrial wastewater treatment. It comes with a black vinyl carrying case, protecting it when carried in a toolbox.

With its rugged design and build, the EC-3 is an ideal meter (tool) that can be used for any application; Ranging from water purification to hydroponics to industrial wastewater treatment. It comes with a black vinyl carrying case, protecting it when carried in a toolbox.

With its rugged design and build, the EC-3M is an ideal meter (tool) that can be used for any and all applications, ranging from water purification, to hydroponics to industrial waste water treatment. It comes with a black vinyl carrying case, protecting it when carried in a toolbox.

HM Digital’s AquaPro series, is a handheld water quality tester that, with a modern design is perfect for today’s tech-savvy and health-conscience consumers. The AquaPro digital water testers are the next generation for today’s modern kitchen.

HM Digital’s AquaPro Series, is a handheld water quality tester which, with a modern design is perfect for today’s tech-savvy and health-conscience consumer. The AquaPro digital water testers are the next generation for today’s modern kitchen.

The PH-80 has proven to be the MOST reliable pH meter in its price range. It has become a favorite in such applications as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water, and more.