Waterproof Microprocessor Large Display TDSTestr
Portable Conductivity Meters

These microprocessor-based testers have one-button calibration with HOLD and Auto-off functions. These waterproof and dustproof testers are ideal for quick conductivity checks in pools and spas, cooling towers and hydroponics operations, or anywhere frequent TDS or conductivity testing is required. Replaceable sensors let you reuse the body without losing the waterproof protection.
TDSTestrs readout in ppm or ppt for total dissolved solids.


  • Large display for easier measurement.
  • Plus series can be used as a dip- or cup-style instrument.
  • Waterproof, dustproof housing (IP67).
  • ATC — automatic temperature compensation.
  • One button calibration.
  • Microprocessor-based functions.
  • Order Tester only or with an optional kit with case, calibration pouches and sample jar.
  • Replaceable electrode.
  • Adjustable TDS factor.
  • Temperature readout on Plus series.
  • Portable — 165 mm L x 38 mm dia; 90 g (meter only).

Download Multi-Range EC/TDSTestr Product Sheet (.pdf, 51.1KB)


TDSTestr 11
TDSTestr 11+
Waterproof, Dual-Range, Pin-Style TDS Tester
Waterproof, Multi-Range, Cup-Style TDS Tester

0 to 2000 ppm; 0 to 10.00 ppt

0 to 200.0, 0 to 2000 ppm; 0 to 10.0 ppt


10 ppm; 0.10 ppt

0.1, 1 ppm; 0.01 ppt


±1% full-scale (of range)


Push button, one point per range

Temp. Compensation



Dual line LCD with temperature


Four 1.5V batteries (included)

Battery Life

>150 hours


6-1/2"L x 1-1/2" dia.

Temp. Accuracy

±0.9°F (±0.5°C)

Temp. Range

0 to 50°C (32 to 122°F)

-5 to 55°C (23 to 131°F)

Temp. Resolution