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Home>Installation Parts & Filter Accessories>Reverse Osmosis System Parts and Accessories > HM-DIGITAL-ZT-2


HM Digital ZT-2 TDS Meter

Range: 0 - 999 ppm (mg/L)

HM Digital ZT-2 Total Dissolved Solids Meter
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Product Code: HM-DIGITAL-ZT-2
  • HM Digital ZT-2 Handheld TDS Meter:
  • The ZT-2 is highly efficient and accurate due to its advanced microprocessor technology.
  • The ZT-2 tests for inorganic materials commonly found in drinking water.
  • The ZT-2 may be used on all types of water except hot water.
  • The ZT-2 is an economy model that is ideal for end-users and retail products.
  • The HM Digital ZT-2 has an auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries.
  • The HM Digital ZT-2 has a measurement range: 0-999 ppm.
  • The ZT-2 has a large and easy-to-read LCD screen.
  • The ZT-2 is factory calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Total Dissolved Solids Information:
  • The EPA Secondary Regulations recommend a maximum contamination level (MCL) of 500mg/liter (500 parts per million (ppm)) for Total Dissolved Solids. Many water supplies exceed this TDS level. When TDS levels exceed 1000mg/L it is usually considered unfit for human use. After reverse osmosis, distillation, deionization, microfiltration, the TDS level should be less than 50 ppm.
  • Test your incoming water supply and the treated water to determine how much Total Dissolved Solids are being removed from the water. At least 80% of the TDS in your water should be removed. If the TDS rejection is less than 80%, it is time to change your RO membrane.
  • HM Digital ZT-2 TDS Meter Specifications:
  • Range: 0 - 999 ppm (mg/L)
  • Resolution: 1 ppm (0-999 ppm)
  • Accuracy: +/- 3%
  • Conversion Factor: NaCl (avg. 0.5)
  • Power source: 2 x 1.5V button cell batteries (included) (357A)
  • Battery life: Approx. 1000 hours of usage
  • Dimensions: 14 x 2.3 x 1.5 cm (5.5 x 0.9 x 0.75 inches)
  • Meter weight: 31.2g (1.1 oz)
  • HM Digital Part#: ZT-2
  • Manufacturer: HM Digital ZT-2

The ZT-2 is also known by the following part numbers:

  • ZT-2, ZT2
  • HM Digital ZT-2 TDS Meter Instructions:



  • Remove the protective cap.
  • Press the ON/OFF button once out of the water. The tester will read "000".
  • Immerse the tester into the water no more than 2 inches.
  • Once in the water, you will see a number on the screen which represents the TDS level in parts per million or milligrams per liter.
  • Wait for the display to stabilize. The tester automatically compensates for temperature variations.
  • Press the ON/OFF button again to turn off the tester. The tester willl automatically shut off after 10 minutes of non-use.
  • After usage, shake off the water from your tester or wipe it with a tissue.

  • WARNING: Do not drop the entire tester in the water or dip beyond the maximum 2" level. This product is not waterproof! Do not use in hot water.
  • What Does the number mean?
  • The number represents the amount of parts per million, or milligrams per liter, of dissolved solids that exist in your water sample. The higher the TDS reading, the higher the amount of dissolved solids in the water. The cleanest water will show a reading of "000".

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