This portable Checker pH tester supplies you with fast and accurate readings on a large LCD The pH electrode can be interchanged with any Hanna pH electrode with a screw connector Measures pH in a range of 00 to 140 with a resolution of 01 pH For general use such as aquariums pools and ponds Please note When you receive your new Checker pH Meter the electrode will be dry It should be conditioned by soaking the tip in pH 7 buffer solution sold separately for a couple of hours Then follow calibration procedure using one or two pH buffer solution values See accessories below for optional pH buffers and other maintenance solutions