Features FUNCTION AND ACTION: The water quality tester pen is designed to monitor PPM levels in plant water, help maintain PPM consistency, and balance feeding and watering. Suitable for water system hydroponics, greenhouse reservoir, DWC, hydroponics. PORTABLE AND PRACTICAL: The lightweight and portable size make it easy to carry a water quality meter in your pocket and take measurements anywhere. Can help you test the quality of water, whether you take to the pool, on a trip, at the beach. ACCURATE AND STABLE: The water quality tester can provide accurate water or nutrient solution readings, keeping the EC, TDS, SALT, S.G, TEMP of the growing water correct to meet the needs of any serious grower. FOR HYDROPONICS: The water quality detector closely monitor ppm values while growing in the plant. Check and adjust the EC value in the hydroponic nutrient solution to help the plant grow. APPLICABLE SCENARIO: Digital water quality meter can be used to test drinking water, swimming pool, water balance, bathtub, spa, wine, beer, and any other liquids, or anywhere you need to test water quality and get accurate data. Specification: Item Type: Bluetooth Water Tester Material: ABS Battery: 1 x 9V polymer battery(not include) 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℉) Package List: 1 x Test Stick 1 x User Manual 1 x Storage Box Package List 1 x Test Stick 1 x User Manual 1 x Storage Box