Great for water, laboratory or plant use, these multiparameter Testrs feature single-junction pH electrodes for longer life and wider range of sample compatibility. Combine measurement capabilities of two testers in one convenient pocket-sized unit. Pin-style conductivity sensors feature stainless steel electrodes for chemical resistance and durability. Replaceable sensor module saves you money by reusing the meter body. Advanced features include auto-shutoff, user-adjustable temperature coefficient and low-battery indicator. Adjustable TDS factor, temperature coefficient, and salinity factor provides accurate readings under challenging conditions. Automatic temperature compensation (ATC) gives accurate readings even with fluctuating temperatures. Waterproof and dustproof (IP67) housing designed for use in dirty and damp field conditions. Come with four 1.5 V alkaline batteries, Eveready A761 LR44 equivalent replacement. Approximately 250 hours continuous use.