Feature: 1. 4 IN 1 DESIGN: Water tester pen is a 4 in 1 design that tests TDS, EC, PH, and TEMP, and is easy to operate with one click to switch between test properties. 2. LARGE HD LCD SCREEN: 4 in 1 PH TDS EC Temp meter uses a large HD LCD screen to ensure that the values can be seen in dimly lit areas. 3. HIGH ACCURACY: Water PH TDS meter uses a titanium alloy probe to measure water with high accuracy, ensuring accurate measurement values. 4. IP65 LEVEL DUSTPROOF WATERPROOF: Digital water quality tester pen is IP65 level dustproof and waterproof, safer and more secure to use. 5. SCOPE OF APPLICATION: Water quality tester is suitable for drinking water, aquaculture, swimming pools, aquariums, hydroponics, laboratories, catering industry, etc. Specification: Item Type: Digital Water Tester Pen Material: ABS Battery Type: Built In Button Battery (Shipped With Built In Button Battery) Battery Model: LR44 Battery Capacity: 3 x 150mAh Gross Weight: 167g/5.9oz Size: Approx. 18.5x3.8cm / 7.3x1.5in. Package List: 1 x Digital Water Tester Pen1 x English Manual3 x Test Strips Note: Please allow some error due to manual measurement.