HM Digital TDS-4 Pocket Size TDS Meter

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The perfect pocket size meter for both consumer or commercial use!

Model: TDS-IV
Part Number: TDS-4
In Stock, Ready to Ship!
MSRP: $35.00
Price: $20.08 
5+ for $18.88 ea
Set of 10 for $17.47 ea
20+ Call

How do we compare?
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$21.00 $0.92 more ea @ BigBrandWater
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$21.00 $0.92 more ea @
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$23.00 $2.92 more ea @
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HM Digital TDS-4 Handheld TDS/Temp Meter

  • Highly efficient and accurate due to its advanced microprocessor technology
  • Hold function -- saves measurements for convenient reading and recording
  • Auto-off function -- automatically shuts off meter after 10 minutes of non-use to conserve batteries
  • Display -- large and easy-to-read LCD screen
  • Factory calibrated -- recalibration is not necessary, but can be done easily with a watch screwdriver

 Easy to Follow Instructions!

Using a clean cup or glass, take a sample of your raw feed water. Remove the protective cap from the Tester. Push the "ON" button to activate LCD display. Submerse the tester's probes into the water sample and observe for approx. 10 seconds. Record the results. Repeat the same procedure with a sample of your reverse osmosis (RO) water. If the system is new or the membrane has been replaced, do not test the first tank of RO water. The first tank of product water will contain sanitizer and possibly carbon fines from your new filters. This will cause false reading. Use either of the following formulas to calculate the percentage of solids (TDS) that your membrane is removing:

TDS Meter Calculation Formula

Tap TDS = 260 ppm
RO TDS = 20 ppm
Rejection = [(260 - 20) / 260] x 100
= [240/260] x 100
≈(.923) x 100
= 92.3%

HM Digital TDS-4 Calibration and Maintenance
HM Digital TDS-4 Three Year Warranty
HM Digital TDS-4 General Usage Calibration Instructions

5.5 x .9 x .55 "
1.2 oz
3 Years
+/- 2 %
2 x 1.5V Button Cell Batteries
Operating Conditions
1 to 50 °C
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