About the Company

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.

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News and Articles

TDS and EC Meters for Hydroponics Explained: Maximum Yield Magazine | 07/20/2010; As technology advances, questions inevitably follow. Due to the rapid growth of the hydroponics and indoor gardening industry, it is important for growers to be familiar with the technology, in this case instrumentation. More …
Calibrating and Caring for your pH Meter: Urban Garden Magazine | 07/15/2010; Tips and techniques for getting the most out of your pH meter, by Rob Samborn, Director of Sales and Marketing for HM Digital. More …