1High Response Rate: The PH tester supports low impedance to ensure a high response rate, which is convenient for your operation. 2Backlight Display: PH meter adopts automatic backlight display, which automatically turns on the backlight display when it is turned on, and the value can be seen clearly even in dark conditions. 3Storage Box: Tap the screen to lock, long press to switch between Celsius/Hua degrees, the TDS meter is equipped with a storage box, which is convenient for you to carry. 4ABS Material: The PH tester is made of high quality ABS material, which is wear resistant and durable, and can be used for a long time. 5Applicable Scenarios: PH tester is suitable for all household and laboratory test applications, including aquariums and swimming pools. Item Type:PH Tester Material: ABS Specification: 1 Set Use Battery: 2 Button Batteries LR44 ( with Inbuilt Battery) Battery Capacity: 280mAh TDS Measurement Range: 1-9999ppm Resolution: 1ppm Accuracy: 2% EC Measuring Range: 1-9999S/cm Resolution: 1S/cm Accuracy: 2% PH Measurement Range: 0.00-14.00pH Resolution: 0.01ph Accuracy: 0.05 Working Temperature: 0C-60C (32-140F) Automatic Temperature Compensation: 0C-60C 1 x Host 1 x Manual 3 x Packs Calibration Powder 1 x Storage Box with Inbuilt Battery