Wireless Bluetooth pH Electrode edgeblu uses HALO™ Bluetooth pH electrodes with a built-in temperature sensor to send measurement data wirelessly to the meter or a compatible Apple or Android device running the Hanna Lab App. Advanced pH Electrode Diagnostics edgeblu features advanced pH electrode diagnostics to ensure worry free measurements. Diagnostics include Hanna??s exclusive CAL Check feature that alerts users to potential problems during calibration. Capacitive Touch edgeblu features a capacitive touch keypad that gives a distinctive, modern look. The keypad is sensitive enough to be used with laboratory gloves and has a fast response. Since the keypad is part of the screen, there are no buttons buttons to get clogged with sample residue.