: Quantity: 1pc Colour: red&white Easy to carry: Digital automatic hydroponics pen is light in weight, small in size and easy to carry. The operation of it is simple and convenient, and has long service life IP67 waterproof: Water quality detector adopts IP67 waterproof grade to prevent dust inhalation and short-term immersion. There is no need to worry about water entering into its parts Display screen: Digital ph meter adopts high-definition LCD backlit large screen, which can measure at night. It contains a 4 x LR44 button battery 4 In 1 function: This water measuring pen is a detector with four-in-one function. It can measure pH, total dissolved solids, conductivity and temperature Widely use: Water purity filter accurate tester is widely used in aquaculture, drinking water, swimming pools, aquariums, food processing and so on