•Waterproof and designed to float •Automatic Temperature Compensation •One button operation - just switch on and test •Lightweight and easy to handle pen style tester •Simple to self-calibrate •Replaceable probe kelilong ph meter is specially designed for high accuracy and ruggedness. It's excellent features are best suited for industries, laboratories and swimming pool, where accuracy is of utmost importance. The tester is equipped with Automatic Temperature Compensation (ATC) to make accurate calibrations, which enhances accuracy in subsequent tests.