Bluelab Multimedia pH MeterBLUELAB PH METER The Bluelab pH Meter is Lightweight and portable, it has an easy to read large display. Simply place the Bluelab pH probe into the solution and the reading will be displayed on the screen. You can use the meter anywhere and anytime as it is portable and does not need a power supply to operate. Calibration is easy peasy with the push buttons on the meter and fresh Bluelab calibration solutions. KEY VALUES: Replaceable double junction