... or decrease the calibration values.Dual LCD display for pH /& .Automatic Temperature Compensation assures that readings are corrected ... IP67 waterproof standard. Portable design with pocket clip.Replaceable pH electrode (P / N: AZ86P9)Probe easy to replace ... application: Pools, Aquariums, Labs, Aquaculture, Car washes, Water testing and Waste water treatment....SPECIFICATION Hold, Max/ Min, Record ...