Gain Express 0.0-14.0 pH & Temperature Meter ATC Dual Display, Portable Digital Pen-Type Tester, IP67 Waterproof Dustproof, for Hydroponics Aquariums Drinking Water Quality Control Testing Automatic buffer recognition, calibration error-free, economic and easy to use Easy calibration, 1-Touch auto calibration up to 3 points IP67 WATERPROOF & dustproof.Dual display Temperature & pH with ATC Wide applications- ideal for hydroponics, aquariums, home, lab & swimming pool