WHAT YOU WILL RECEIVE:

ONE (1) NEW HM Digital DM-1: In-Line Dual TDS Monitor

 

CLICK BELOW FOR YOUR WARRANTY AND CALIBRATION INSTRUCTIONS

 

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Measure the tap water coming in and the purified water going out of your water filtration system.

By measuring total dissolved solids (TDS) levels of feed and product water lines simultaneously, you can compare rejection rates and gauge reverse osmosis membrane, water filter, and water purification performance.

Measuring feed and product water helps ensure your water filters are working properly.

 

Features

  • Displays TDS levels of the feed water and product water with in & out electrode probes.
  • Highly efficient and accurate due to its advanced microprocessor technology.
  • Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use.
  • Dual Range 0-9990 ppm (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.)
  • Calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Comes equipped with Quick-Connect T-fittings.
  • Installs quickly and easily.

Specifications

Range: 0-9990 ppm
Accuracy: ±2%
Conversion Factor: NaCl (avg. 0.5)
Cable Length: 24.5" (including sensor)
Fittings: 1/4" quick connects standard. Also available with 3/8" or 1/2" (additional fee)
Power source: 2 x 1.5V button cell batteries (included)
Battery life: approx. 1000 hours of continuous use
Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.)
Weight: 79.4 g (2.8 oz.)

 

TDS & EC Calibration

  1. HM Digital meters come factory calibrated (at 342 PPM or 1413 µS, depending on the product) and are ready to use out of the box. They are designed to stay consistent. However, after prolonged usage, it may help to recalibrate your meter using a commercial standard NaCl-based solution (for most HM Digital meters), which is approximately, 0.5 µS of conductivity.
  2. Immerse the meter into the calibration solution. If the meter does not read within 2% of the calibration solution, adjust the reading by either digital calibration (for some products) or inserting a mini screwdriver (not included) into the trimmer pot (the hole on the back of the meter). Turn the trimmer clockwise to increase the reading and counterclockwise to decrease the reading. Note that the adjuster is very sensitive. Always refer to the calibration instructions for your particular product.

Note: HM Digital products are calibrated with a 342 PPM NaCl or 1413 µS solution. This is suitable for most applications. However, if you are measuring samples that are consistently over 1000 PPM, it is recommended to recalibrate the meter for that specific application. TDS meters are more accurate when calibrated at levels that are as close as possible to the sample being tested (such as for hydroponics, aquaculture, tinting and dying or brackish water).