Easy, Fast And High Accuracy: Just Remove The Protective Cap And Immerse The Ph Meter Electrode In The Solution And Press The On/Off Button To Measure. The Tester Features A Sensitive Electrode Sensor To Read Accurate Ph Levels From 0-14. Ensure Your Swimming Pool, General Hydroponic Ph Or Even Drinking Water Has Perfect Ph Balance And Provides A Safe To Use Auto Calibration: Auto Calibration: The Ph Tester Has An Automatic Temperature Stabilization Feature That Adjusts To Temperatures And Water Quality To Give Ph Readings Almost Instantly. You Can Also Calibrate The Tester With Just One Button Using The Buffer Solution Automatic Temperature Compensation: There Is No Longer Any Need To Worry About The Temperature Of The Liquid To Be Tested, As The Ph Meter Has Built-In Automatic Temperature Compensation (Atc). Thus, It Can Accurately Determine The Ph Value Of The Sample At Any Temperature Within The Range Of 0C To 60C Wide Uses: Ideal For Home Or Laboratory Use, Suitable For Testing The Ph Balance Of Drinking Water, For Ro System For Aquarium, Swimming Pool, Spa, Or Hydroponics. Suitable For A Wide Range Of Applications Satisfaction Guaranteed: Comes With 1 X Ph Meter, 1 X User Manual, 2 X Lr44 1.5V Button Cells (Built-In)