Material: ABS Size: 155*29mm blue color Quantity: 1 piece Package content: 1 PH test pen. 1. INCREDIBLY ACCURATE - Ensure your pool, general hydroponics, or even drinking water is in perfect pH balance and safe to use with the tester's pH accuracy. The tester has a sensitive electrode sensor to readprecise pH levels. The included detailed manual will show how to get the best accurate and stable reading 2. Automatic Temperature Compensation (ATC): The digital ppm tester and pH tester have ATC function, the measurement data will not be affected by the temperature of the water, no matter the ppm or pH of the water is tested. /p> 3. WIDE USE - The pocket pH meter is the ideal test kit for home and laboratory use. Ideal use for testing water, swimming pools, aquariums, spas, hydroponics, food, wine and beer and much more. .Items from Sheng Xinshun's shop