The water quality tester has 5-in-1 function, which can measure EC/TDS/SALT/S.G/TEMP with high precision, and know water quality clearly to ensure your family member's health. Features: ACCURATE AND RELIABLE: Equipped with premium quality sensitive probe, water quality tester enables quick and convenient test. Put the probe into water and LCD shows accurate results in seconds. AUTOMATIC CALIBRATION: It needs to be recalibrated after a long period of inactivity or frequent use. The auto calibration function allows you to calibrate the water quality tester easily. Just use the buffer powder and press the "CAL" button to calibrate. PORTABLE DESIGN: Handheld pen style makes it conveniently fits in your pocket or bag, so you can take measurements anytime, anywhere. It can help you test it whether you take it to the pool, on a trip, to the beach or camping. LCD BACKLIT DISPLAY: Water quality tester bright backlit LCD display, easy to use no matter in the day and night environment, accurate measurement and clear display results. WIDE USAGE: Ideal for testing drinking water, swimming pools, aquarium, spas, hydroponics, food and more. Specifications: Model: BT-300 / BT-600 (Optional) Material: ABS Range: EC: 0-19900us/cm, 0-199.0ms/cm TDS: 0-19900ppm, 0-199.0ppt SALT: 0-199.0ppt, 0%-20% S.G: 1.000-1.400 Temp: 0℃-50℃(32℉-122℉) Resolution: EC: 1us/cm(＜1999us/cm), 10us/cm(＞1999us/cm), 0.1ms/cm TDS: 1ppm(＜1999ppm), 10ppm(＞1999ppm), 0.1ppt SALT: 1ppm(＜1999ppm), 10ppm(＞1999ppm), 0.1ppt, 0.01% S.G: 0.001 Temp: 0.1℃(0.2℉) Accuracy: EC、TDS、SALT: ±2%F.S、Temp Battery: 9V (Not included) Temperature Compensation: 0℃-50℃ Operating Temperature: 0℃-50℃ Item Size: 325 * 35 * 20mm / 12.79 * 1.38 * 0.79in Item Weight: 168g / 5.93oz Package Weight: 280g / 9.87oz Package Size: 36 * 6 * 5.3cm / 14.17 * 2.36 * 2.09in Package List: 1 * Water Quality Tester 1 * User Manual (English) 1 * Water Quality Tester 1 * User Manual (English)