Feature: 1. Let you no longer worry about whether the ph meter is accurate, the 3 calibration packages we give can help you test whether our ph meter is accurate. 2. The mini size ph meter we designed allows you to easily put it in your pocket, so you can take measurements anytime, anywhere. It can help you test it whether you take it to the pool, on a trip, to the beach or camping. 3. As a tool to improve the quality of life. Can be used to test drinking water, swimming pools, PH balance in aquarium, RO system, spa or hydroponics. Basically all the environments that need to test PH value can use this tester to get accurate data. 4. PH tester has a sensitive electrode sensors ,simply press \"ON\", It only takes a few seconds for your results to appear on screen. 5. No more need to take care about the temperature of testing liquids, as the PH meter has an auto temprature compensationfeature that adjusts to water temperatures and water quality. Specification: This digital pen style is a fine instrument for any aquarium, the fishing industry, swimming pools, school laboratories, food and beverage, etc. And, it is fine for all basic water testing applications. Features: Let you no longer worry about whether the ph meter is accurate, the 3 calibration packages we give can help you test whether our ph meter is accurate. The mini size ph meter we designed allows you to easily put it in your pocket, so you can take measurements anytime, anywhere. It can help you test it whether you take it to the pool, on a trip, to the beach or camping. As a tool to improve the quality of life. Can be used to test drinking water, swimming pools, PH balance in aquarium, RO system, spa or hydroponics. Basically all the environments that need to test PH value can use this tester to get accurate data. PH tester has a sensitive electrode sensors ,simply press "ON", It only takes a few seconds for your results to appear on screen. No more need to take care about the temperature of testing liquids, as the PH meter has an auto temprature compensationfeature that adjusts to water temperatures and water quality. Specifications: Resolution: 0.01 pH Error: PH 0.05 Operating temperature: 0℃-60℃ Battery: 2 * 1.5V LR44 Item size: 155 * 31 *18mm / 6.1 * 1.2 * 0.7in Package size: 167 * 52 * 30mm / 6.6 * 2.0 * 1.2in Package weight: 110g / 3.9ounce Packing List: 1 * PH Tester Package List: 1 * PH Tester