The professional pH meter is the perfect tool to test your water level. Suitable for aquarium swimming pool and environment water. Features: Qualified pH meter with replaceable electrode. Large LCD display clear with backlight, easy to read and accurate measuring functions. Simple to use, sturdy and durable to use. Reliable basic glass electrode pH meter. ATC function. CE and RoHS certified to offer more safe and accurate measurement. Apply in water sources, aquarium, hydroponics, spas, swimming pools and other water systems. Very convenient to change its electrode, and complete with various industry test needs. Features: Range : pH 0.00 14.00 Resolution: pH 0.01 Accuracy: pH 0.1 Temperature compensation: 0 50 (32F 122F) Ambient temperature: 050 (32F122F) Calibration mode: ATC Battery: 4 x 1.5V AG-13 button cell batteries (not included) The color red Material: ABS Item Size: Approx. 18 * 5 * 2.5cm / 7.1 * 1.9 * 1.0in Item weight: approx. 57.1g / 2.0oz Package size: approx. 21 * 10.4 * 5cm / 8.3 * 4.1 * 1.9in Package weight: approx. 144g / 5.1oz Package List: 1*pH meter 1*user manual 1*mini screwdriver Note: The data is all manual measurement, please allow 1-3cm error; due to the difference in light and display, there would be a certain color difference, please refer to the actual item received.