Feature: 1. Basic Information: This is a 4 digit water quality detector, which can measure PH, temperature value of a water quality at the same time, with complete functions. 2. Large Screen: Backlight or no backlight is optional, and digital clear reading is fast, convenient, simple and clear. 3. Accurate Measurement: The water quality tester has microprocessor based instruments, which can improve speed and accuracy. The battery and automatic function error prevention system (BEPS) can extend the battery life and prevent incorrect readings. 4. Wide Application: This water quality tester is an ideal choice for domestic water, aquaculture, laboratory, spa, swimming pool and other water quality tests. 5. Easy Carrying: Comes with small size and lightweight, you can easily take this water quality tester with you to help with your work. Specification: Item Type: Water Tester Mode: PH 8424 Material: ABS Range: PH Value: 0.00 to 14.00ph Temperature: 0 ℃ to 100 ℃ Resolution: PH Value: 0.01pH Temperature: 0.1 ℃ Accuracy: PH Value: ± 0.01pH Temperature: ± 0.5 ℃ Power Supply: 9V 6f22 lithium battery 1300mah x 1 (shipped with built in battery) Temperature Compensation: 0 ℃ to 60 ℃ Working Temperature: 0 ℃ to 60 ℃ . Package List: 1 x Water Quality Tester 1 x PH Electrode 1 x TEMP Electrode1 x ORP Electrode 1 x Screwdriver 1 x Manual