Use The LaMotte Waterproof Swimming Pool Salt Test Meter to measure sodium chloride levels between 0 – 10,000 ppm in your swimming pool. The LaMotte Salt Test Meter is completely waterproof and features an auto shut-off function. Includes a deluxe carrying case and 1 calibration solution Uses four 1.5V batteries. Automatic Temperature Compensation Range: 0 - 10,000 ppm salinity Accuracy: ± 1% full scale (± 2% above 5 ppt) Warranty: 1 Year