Product Description Material: ABS Size: 155*29mm color: blue Quantity: 1 piece Package content: 1*PH test pen 1. INCREDIBLY ACCURATE - Make sure your pool, general hydroponics, or even drinking water is in perfect pH balance and safe for use with tester pH accuracy. The tester has a sensitive electrode sensor to read accurate pH levels. The included detailed manual will show you 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 water temperature, no matter whether the ppm or pH of the water is tested . 3.WIDE USE - The pocket-size 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.