KL-03(II) Waterproof Pen-type pH Meter Pocket sized and feather-weight for portable use in a large number of applications. It is utilize user-replaceable electrodes. Technical Specification: Range:0.00~14.00pH Accuracy:+/-0.1PH Resolution:0.01PH Operating temperature:0℃~50℃ Automatic Temperature Compensation:0℃~50℃ Plug:Fixed Electrode Power Supply:4x1.5V(AG13) Dimensions:165x26x26 mm Weight:63g