Features: Test the pH level and temperature of solution/water with data hold function. Pocket size, lightweight and portable with switchable backlights & large LCD display for clear reading. Replaceable pH sensor probes - The electrode probes can be replaced with insert type design for convenient and-fast replacement. ATC-function (automatic temperature compensation), automatic calibration and waterproof design. Apply in water sources, soil-free growing, aquarium, hydroponics, laboratory, spas, swimming pools and other water-systems. Specifications: Material:ABS Size: Approx.15.4x3x1.4cm/6.06x1.18x0.55inch Color:Yellow/Blue Package Includes: 1x LCD PH Meter(Battery not included) note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.