HM Digital® Pocket-Size TDS Meter

HM Digital® Pocket-Size TDS Meter

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List Price: $2916
Now: $2347
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HM Digital Handheld TDS Tester

The TDS-4 is an ideal pocket meter that can be used for any and all applications, ranging from water purification, to hydroponics, to aquariums, to industrial waste water treatment.


  • Pocket size makes it ideal for portability and storage

  • Hold Function

  • Auto-off Function (After 10 min.)

  • Factory calibrated with 342 ppm NaCl solutio



  • Aquaculture

  • Aquarium

  • Drinking Water

  • Food & Beverage

  • Water Treatment


HM Digital Pocket-Size TDS Meter

Length (in): 5.5

Resolution:  0-999: 1 ppm; 1000-9990 10 ppm (indicated by a ‘x10’ icon)

Width (in): .9

Range:  0 – 9990 ppm (mg/L)

Height (in): .55

EC-to-TDS Conversion Factor:  NaCl (avg. 0.5)


Accuracy:  +/- 2%

ATC:  Built-in sensor for Automatic Temperature Compensation 

Power source:  2 x 1.5V button cell batteries (included)

Battery life:  1000 hours of usage


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