You’ll never loose the Oakton WD-35650-10 ORPTestr10 by dropping it into a tank or pond; the waterproof ORPTestr floats! IP67-rated housing protects the instrument from rugged field and plant environments. Push-button calibration lets standardize tester in calibration solutions, or making it agree with an established work standard.
Replaceable sensor on the WD3565010 lets you reuse meter body many times without losing waterproof and dustproof protection. Large surface area platinum band sensor gives a faster, more stable response.