TDS20 Value Pocket TDS Tester Meter

TDS20 Value Pocket TDS Tester

±1% FS, Auto Calibration (1-2 points with auto buffer recognition), Auto Temp. Compensation (0 to 50˚C), Conductivity (EC)
In stock

The Apera Instruments TDS20 Value Pocket TDS Tester is simply the most reliable pocket conductivity ppm tester/meter with the best value for all kinds of routine testing, including tap water/drinking water testing, agriculture, aquaculture, swimming pool, education, etc.

  • The unique platinum black conductivity probe technology ensures wide range measurement with accuracy and consistency.
  • An ultra clear 180˚ viewing angle screen with temp./TDS value dual display and indications of completed auto calibrations and stable readings.
  • Complete kit with calibration solutions (1413 µs and 12.88 mS), AAA batteries, and a lanyard all in a rugged carrying case.
  • 1-2 points auto calibration and 0 to 50˚C auto temp. compensation, ±1% F.S accuracy with 0 to 20.00 mS/cm wide conductivity measuring range
  • Self-diagnosis with out-of -range warning and incorrect calibration warning.
  • IP67 Water-proof and dust-proof, floats on water so no need to worry if you drop it in the water by accident.
  • 200 hours' continuous operation powered by AAA batteries (with low power warning and auto power off in 8 min if no operation).

Meter’s Technical Specs



0 to 100.0 ppm, 0 to 1000 ppm, 0 to 10.00 ppt


0.1/1 ppm; 0.01 ppt


±1% F.S

Calibration Points

Automatic 1 to 2 points

Temperature Compensation

Auto Temperature Compensation

0 to 50 ˚C (32 to 122˚F)



0 to 50˚C (32 to 122˚F)






180˚ Viewing Angle LCD

Stable Reading Indication

Smiley Face icon

Low-Battery Warning

Battery icon flashing, reminder of battery replacement



Heads-Up Function


Auto. Power-Off

Yes, auto power-off in 8 minutes without operation

Waterproof Rating

IP67; Floatable


DC3V, AAA batteries*4

Battery Life

Continuous operation up to 1000 hours

Dimensions& Weight

Tester: (40*31*178) mm/ 107g With case:(190*165*40) mm/ 438g

Electrode’s Technical Specs


Regular water solution testing, such as pools and spas, hydroponics, tap water, drinking water, water treatment, waste water treatment, aquaculture, etc.

Type of Sensor

BPB (Brush-Resistant Platinum Black)



Temperature sensor



0.1 µS to 20.00 mS

Temperature Range

0 to 50˚C (32 to 122˚F)

TDS20 Manual (TDS20-v2.1.pdf, 545 Kb) [Download]

I tested 4 differrent water samples.
1- home tap water : 150 ppm
2- Brita water pitcher ( poured with tap water) : 120 ppm
3- Wellsely farm bottled water: 0.8 ppm
4- Zerowater water pitcher: 0.3 ppm

I will return Brita water pitcher to Costco!! and keep using my Zerowater pitcher and I will keep buying bottled water from Bj's club!
Dont think I dont like Costco! I love it because of their organic ground beef!
Excellent meter. I live in the desert so knowing the TDS levels in my drinking water is important to me. Additionally one can easily determine how well the filtering systems are working with this meter. I have found it quite amazing that some of the "filters" really don't remove nearly as much as they claim to. The calibration on this meter is a process but not too overly difficult. The auto temp variation is important and saves a lot of time in not having to deal with water temp. The kit comes complete and ready to use with all needed solutions included that are needed for calibration. It makes testing water very easy and makes you want to test all the water you drink. Has low battery and incorrect calibration notifications built in which take the guess work out of things. Also has a water temp compensation. Very handy tool,
This kit from Apera Instruments might be almost overkill for everyday quick readings of TDS levels in that it does some setting up before you can start. This takes about 20 minutes, but then you can go wild with testing. TDS levels out of whack indicate problems and require more in-depth testing, but this is an important first step in finding out if there IS a problem. Love this kit!
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