HM Digital Inc. formerly known as Heemang Electronics is an original equipment manufacturer established in 1987. It is popular for its TDS meter that has been recognized worldwide. HM Digital is well known globally for providing its customers the best values in water testing instrumentation.

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HM Digital ASP-20 unit comes with the following:

  • Twenty (20) packs of Assorted Solutions
  • Five (5) 20 ml packets of pH 4 buffer
  • Five (5) 20 ml packets of pH 7 buffer
  • Five (5) 20 ml packets pH storage solution
  • Five (5) 20 ml packets EC/TDS calibration solution



COM-100: Waterproof Professional Series EC/TDS Meter

The HM Digital COM-100 is one of the EC/TDS/Temp meter at a professional grade level perfect for all water quality testing, water treatment, ecology testing, labs & scientific testing, colloidal silver, wastewater regulation, water purification applications, pools & spas, hydroponics, aquaculture,



COM-300: Waterproof Professional Series pH/EC/TDS/Temp Meter

The HM Digital COM-300 is one of the professional grade level pH/EC/TDS/Temp meters perfect for all water quality testing, water purification applications, water treatment, wastewater regulation, aquaculture, colloidal silver, labs & scientific testing, hydroponics, pools & spas,  boilers & cooling towers, ecology testing and more.



HM Digital  CP-1000 

HM Digital CP-1000 unit comes with 20 packs of Sodium Chloride (NaCl) EC/TDS calibration solution and 20 packets of 20 ml 1000ppm / 2mS / 2000 µS solution



HM Digital DM-1: In-Line Dual TDS Monitor

HM Digital DM-1 is a consumer-friendly TDS monitor that measures the input and output of a water filtration system. It measures the feed water (input) versus the product water (output) at any time. It became ideal for everse Osmosis (RO), Deionized water (DI) filtration systems that works perfectly in applications like Aquariums, Hydroponics, drinking or potable water and many more.



HM Digital HM-200: Portable pH/EC/TDS/Temp Monitor

The HM Digital HM-200 is a portable pH/EC/TDS/Temp monitor perfect for water purification applications, labs & scientific testing, aquaculture, wastewater regulation, all water quality testing, water treatment, colloidal silver, hydroponics, pools & spas, boilers & cooling towers, ecology testing and more.

HM-500 Hydromaster


HM-500 HydroMaster: EC/TDS, pH, Temp Continuous Monitor

HM-500 Hydromaster is what users can rely on when it comes to monitoring and indicating pH, EC/TDS, and Temp providing accurate and stable readings. The HM-500 is portable and can be wall mounted due to its rechargeable battery. It is also user friendly as it comes equipped with high and low alarm set points, touch screen, and recorded readings. The unit is ideal for applications such as lab, aquariums, pools, hydroponics and etc.



PH-200: Waterproof Professional Series pH/Temperature Meter

HM Digital PH-200 is a professional temperature meter perfect for all pH testing water. It comes with an advanced microprocessor that provides highly accurate dependable readings in various applications like wastewater regulation, hydroponics, purification applications, pools & spas, ecology testing, boilers & cooling towers  ,labs & scientific testing, aquaculture, agriculture. colloidal silver, water treatment, coffee and wine.




HM Digital PH-P4

HM Digital PH-P4 is composed of 20 packs of pH p4 buffer solution and 20 packets of 20 ml pH 4 buffer.



HM Digital PH-P7

The HM Digital PH-P7 unit that comes with 20 packs of pH 7 Buffer solution and 20 packets of 20 ml pH 7 buffer.




The HM Digital PH-PSTOR is an electrode storage solution that comprises of 20 pack pH storage solution and 20 packets of 20 ml potassium chloride (KCl) storage solution.



PH-STOR: pH Electrode Storage Solution

PH storage solution for HM Digital’s PH-200 / PH-80 as well as other brands of pH meters. Always make sure your sensor is kept in an electrode storage solution. If dry, refill the pH meter cap with the PH-STOR storage solution. The sponge should be moist (not soaking wet).



SM-1: In-line Single TDS Monitor

HM Digital SM-1 has an easy-to-read single line TDS monitor providing a digital readout. The SM-1 is perfect for any water filtration system including reverse osmosis systems, coolers and much more.



HM Digital TRM-1: Triple In-Line TDS Monitor

HM Digital TRM-1 is a unique TDS monitoring that offers the user a 3-point contact during the process of filtration. This Triple In-Line TDS monitor allows checking for TDS levels at three points such as with multiple points in an RO system, or DI/RO (deionization / reverse osmosis) and many more.