Aqua Master: P110 Pro Combo Pen Single unit to measure pH and EC Large easy to read, digital display IP67 waterproof rated Fully calibrated Replaceable electrode Calibration indicator 2 decimal places AAA batteries Aqua Master Replacement Probe P100 PRO Suitable for the Combo Pen P110 Pro. Replacing the electrode: Properly unscrew the sealing ring in the lower part of the meter. Remove the defective/old electrode by gently pulling it. Carefully place the new electrode with the recess in the correct position so that the connectors properly connect and do not damage the meter or electrode. Check that the rubber seal is properly placed. Tightly tighten the sealing ring. Calibrate the meter as described in this manual. The meter is now ready for use.
