Azzota® Waterproof Pocket TDS Pen Meter WPTDS-20
Pocket TDS Tester

Multi-range pocket TDS meter, 1 to 3 points calibration, selectable TDS conversion factor, setup menu contains 5 options, accuracy: 1% F.S.

Carry case and calibration standard included.

• Multi-range pocket TDS meter covers the low, mid, high ranges.
• Platinum conductivity cell provides quick and reliable measurement results.
• 1 to 3 points calibration with automatic recognition for TDS standards.
• Auto-Read function senses and locks the measurement endpoint.

Auto-Power Off effectively conserves battery life.
• Setup menu allows setting the number of calibration points, TDS conversion factor, etc.
• Reset function automatically resumes all settings back to the factory defaults.
• Replaceable electrode module reduces maintenance and replacement cost.
• Waterproof feature to ensure complete protection in harsh environments.





0 to 10.00, 100.0, 1000ppm, 10.00, 20.00ppt


0.01, 0.1, 1


±1% F.S.

   Calibration Points

1 to 3 points

   Calibration Solutions

Standard: 71.8ppm, 774.7ppm, 7447ppm



0 to 60°C/32 to 140°F





   Offset Calibration

1 point

   Calibration Range

Reading ±10°C

   General Specifications


   Temperature Compensation

0 to 60°C/32 to 140°F, automatic

   TDS Factor


0.1 to 1.0 (default 0.5)

   Hold Function

Manual or auto-endpoint

   Auto-Power Off


8 minutes after the last key pressed

   Sensor Type





Dual-line LCD (21×21mm)



2×1.5V AAA batteries

   Battery Life


Approximately 200 hours of continuous use








This model will soon be discontinued, an updated version can be found here: