Dual channel hand meter for measurements of pH, mV, relative mV, ion concentration and dissolved oxygen via optical RDO sensor: robust, accurate, maintenance-free, with 'Intelligent Sensor Management' (ISM®) and exchangeable cap for renewal of the sensor. - The RDO technique allows for faster and more stable measurements and minimised disturbances, even with low oxygen concentrations. - Full GxP support: simple, safe operation. - 5-point pH calibration with 7 pre-defined and one user-defined buffer set. - Data memory of 500 GLP data sets with date / time, sensor-ID and SN, user- and sample-ID. - Wireless IR communication. - Large graphical display with backlight. Dual channel hand meter for measurements of pH, mV, relative mV, ion concentration and dissolved oxygen via optical RDO sensor: robust, accurate, maintenance-free, with 'Intelligent Sensor Management' (ISM®) and exchangeable cap for renewal of the sensor. - The RDO technique allows for faster and more stable measurements and minimised disturbances, even with low oxygen concentrations. - Full GxP support: simple, safe operation. - 5-point pH calibration with 7 pre-defined and one user-defined buffer set. - Data memory of 500 GLP data sets with date / time, sensor-ID and SN, user- and sample-ID. - Wireless IR communication. - Large graphical display with backlight.