HM Digital, Inc.

Model TDS-4TM - Pocket-Size Meter with Digital Thermometer



Ideal for all water purification applications, wastewater regulation, aquaculture, hydroponics, and colloidal silver.

TDS Range: 0-9990 ppm (mg/L) 
Temp. Range: 0-80 degrees Celsius 
Resolution: 0-999: 1 ppm; 1000-9990: 10 ppm (indicated by a 'x10' icon)  
Temperature Resolution: 0.1 degree Celsius (Celsius only)
Accuracy: +/- 2%
EC-to-TDS Conversion Factor: NaCl (avg. 0.5) 
ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees Celsius (33 to 122 degrees Farenheit) 
Power source: 2 x 1.5V button cell batteries (included)  (LR44 or equivalent)
Battery life: 1000 hours of usage 
Dimensions: 14 x 2.3 x 1.5 cm (5.5 x .9 x .55 inches) 
Weight: 34g (1.2 oz)

UPC: 891144000199

  • Measures TDS and salt levels of freshwater up to 9990 ppm.
  • Includes an internal digital thermometer (celsius only).
  • Hold Function - Locks the reading on the screen outside of the water.
  • Auto-off function - Turns off meter after 10 minutes of non-use to conserve batteries.
  • Dual Range - Measures from 0 - 999 ppm, with a resolution of 1ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.
  • Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.

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