... Store up to 99 Data Sets SELON902 pH meter, DO meter used for measuring the pH, ORP, Dissolved Oxygen in liquid.Multi-point ... Electrode Slope:After pH calibration, the percentage slope of the sensor is displayed before the meter returns to measurement ... .7kgMeter Included: pH Electrode (Made in UK), DO Probe (Made in US), Temperature Probe, Power Adapters SELON902 pH Meter / DO Meter (CE Certificate) ...