The Oakton pH 6+ Meters feature up to five-point, push-button calibration with auto-buffer recognition, and easy-to-use display of pH or mV, and temperature. The Ion 6+ Meters offer a direct readout of ion concentration, with pre-programmed ion calibration points. The CON 6+, TDS 6+, and SALT 6+ Meters supply auto-ranging conductivity or TDS with temperature measurements. The DO 6+ Meters have a low-maintenance, galvanic probe, which requires no warm-up time. These meters can be used to test water quality in wastewater, surface water, ground water or drinking water. Each of the meters in the series includes a rubber boot with built-in stand for protection and added functionality.