
TDS Pocket Tester, Range: 0 to 999 ppm

Pocket TDS Pen, Range: 0 to 1990 ppm

Economical Pocket size pH Tester

pH / Temperature Meter, 0.1 pH Resolution, replac…

Pocket-size pH / ORP / Temperature Meter with rep…

Range: 0 to 1990 uS/cm

EC: 0 – 3999 uS/cm, TDS: 0 – 2000 ppm

Standard Portable pH Meter with 0.01 pH resolutio…

pH / Temp Meter with Resolution 0.01 pH & Acc…

Range: 0 to 1990 μS/cm

TDS tester, Range : 0 to 1990 mg/L (ppm)

Standard Portable DO Meter
O2 Range: 0.0 to…

pH: 0.0 to 14.0 pH, EC: 0 to 1990 uS/cm, TDS: 0 t…

Digital Refractometer for Seawater Measurements

Free chlorine handy photometer
Range: 0.00 …

Total chlorine handy photometer
Range: 0.00…