Automatic Calibration-This Factory Calibrated Digital Ph Meter, This Digital Ph Tester Gets The Result Fast and Accurate, The Digital Ph Tester Has Automatic Temperature Compensation Function Which Adapts to The Temperature of The Water and Water Quality to Give Ph Readings Almost Instantly High Accuracy - The Water Ph Meter Has A Sensitive Electrode Sensor to Read Accurate Ph Levels. The Detailed Manual Included Will Show You How to Get The Best Accurate and Stable Reading, Ensure Your Swimming Pool, General Hydroponic Ph Or Even Drinking Water Has Perfect Ph Balance. Automatic Temperature Compensation - The Automatic Digital Ph Meter Kit Has An Automatic Temperature Compensation Feature That Adjusts to Water Temperatures and Water Quality to Give Ph Readings Almost Instantaneously.