Smart Bluetooth PH Meter 1）Powered by the YINMIK Mobile App. 2）Precision Real-time Bluetooth Data Transmission, Saved Data Automatically or Manually Allows You to Save, Manage, and Share Your Test Data at Your Fingertips. 3）Support PH 5-point Calibration Method (usually 3-point): Calibration to Ensure the Accuracy of the Measurement. 4）High Precision Probe, Automatic Temperature Compensation. 5）Support Mobile Phone Control with Backlight and without Backlight,Displayed the Battery Level.