Oakton Waterproof Ultra Basic TDS Tester

Push-button calibration and high 1% full scale accuracy! 
Waterproof, dust proof housing that floats is certifiable to IP67 standards 
Replaceable sensor lets you reuse same meter body, saving you money 
Automatic Temperature Compensation 0 - 1990 PPM 
Hold function, Auto-Off 
Our waterproof microprocessor TDSTestr basic offers push-button calibration and 1% accuracy in a rugged waterproof housing. Never worry about losing your tester in a pond or tank