Feature: 1. [Liquid Display] Large size backlit LCD screen is adopted, which has greater data reading angle and night reading ability 2. [Safe and Reliable] Reliable water quality detector, accurate and fast, equipped with sensitive and high quality probes, the water quality detector can test quickly and conveniently 3. [Accurate Display] Put the probe into the water and the LCD will display the accurate results in a few seconds 4. [Automatic Temperature Compensation] Equipped with automatic temperature compensation, it can be adjusted according to water temperature and water quality to provide almost immediate PH reading 5. [Scope of Application] An ideal water tester for water, swimming pool, aquarium, spa, hydroponics, food, wine and beer Specification: Item Type: Water Testing Pen Product Size: Approx. 15.3 x 2.8 x 1.5cm / 6 x 1.1 x 0.6in Weight: Approx. 54g / 1.9oz Battery Parameters: 2 x LR44 Button Batteries 160mAh (Shipped with Built in Battery) Centigrade: 0.1-80℃ Applicable Industries: Hospital, Natatorium, Cdc, Water Plant, Laboratory, Aquaculture. Package List: 1 x Water Testing Pen(Shipped with Built in Battery) Note: Please allow 0 to 2 cm error due to manual measurement. Thanks for your understanding.