The 10 Best TDS Water Testers in 2027

The Apera TDS20 is accurate to ±1% F.S. and reads 0 to 10.00 ppt (10,000 ppm). It compensates for temperature automatically from 0 to 50 °C, is IP67 and floats, and costs $79.00 as a kit with a carrying case and calibration solutions.

The Hach Pocket Pro Low Range TDS Tester reads 0 to 1999 ppm to ±1% FS, calibrates itself at 2 points and is rated IP67. Hach’s store price is $201.00.

The Hanna DiST 1 (HI98301) reads 0 to 2000 ppm at 1 ppm resolution and ±2% full scale, with automatic temperature compensation from 0 to 50 °C. It costs $79.99.

The Hanna DiST 5 (HI98311) reads TDS from 0 to 2000 ppm at ±2% F.S. and EC from 0 to 3999 µS/cm, with an EC to TDS factor you can set from 0.45 to 1.00. It costs $154.99.

The Extech EC400 ExStik reads TDS from 0 to 9.99 ppt (9,990 ppm) at ±2% FS, stores up to 15 labeled readings and is rated IP57. It costs $140.00.

The Bluelab Conductivity Pen reads EC, ppm 500 (TDS) or ppm 700. On the ppm 500 scale it covers 0 to 5000 ppm at 10 ppm resolution and ±50 ppm at 25 °C, and it costs $99.00.

The HM Digital TDS-3 reads 0 to 9990 ppm at ±2% (0 to 5000 ppm), compensates automatically from 1 to 50 °C and a fixed 0.5 factor. HM Digital does not publish a price.

The Milwaukee Instruments CD97 reads 0 to 999 ppm to ±10 ppm with automatic temperature compensation from 5 to 50 °C and one-point manual calibration. It costs $34.50.

The HM Digital TDS-EZ reads 0 to 9990 ppm at ±3%, with 1 ppm resolution to 999 ppm and 10 ppm above. Its battery lasts approx. 1000 hours. HM Digital does not publish a price.

The APEC TDS Meter reads 0 to 1999 ppm at 1 ppm resolution, with auto reading, hold and auto shut off. Accuracy is ±2% under 300 ppm, ±5% from 300 to 800 ppm and ±10% above 800 ppm. It costs $18.99.