HM Digital manufactures advanced water testing instruments, including TDS, pH, EC, and temperature meters for consumer and commercial applications.
HM Digital, Inc. is a leading manufacturer of high-quality water testing instruments and monitors. Based in Los Angeles, California, the company specializes in producing advanced handheld testers, inline monitors, controllers, and refractometers.
Their most popular product lines include Total Dissolved Solids (TDS) meters, pH meters, Electrical Conductivity (EC) meters, and temperature quality testers. Designed for both personal and commercial use, HM Digital devices are essential for accurately monitoring drinking water, hydroponics systems, aquariums, food and beverage processing, and water filtration networks like reverse osmosis (RO) systems.
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While most meters are factory calibrated, they can be recalibrated using a laboratory-certified calibration solution. Dip the meter in the corresponding solution, enter calibration mode (often by holding the TEMP/CAL button), adjust the reading to match the solution using the up/down buttons, and press the power button to save your calibration.
You can find instruction guides and user manuals for HM Digital products directly on this page, or you can download them from the official website at hmdigital.com/product-manuals.
Portable HM Digital meters typically run on replaceable batteries. Devices like the TDS-EZ use 2 x 1.5V (LR44) button cell batteries, while some professional combo meters use 2 x AAA batteries. Always check your specific user guide for battery replacement instructions.
Warranty periods vary by product, but many digital meters and monitors carry a one-year or two-year limited warranty against defective materials and workmanship from the date of purchase. For specific warranty claims, you can contact Warranty@HMDigital.com.
The electrode is typically shipped with a wetted sponge of Potassium Chloride (KCl) storage solution. If the sponge is dry upon arrival, use the included storage solution pack to saturate the probe and let it sit for a minimum of 30 minutes before first use.