Online Dissolved Oxygen Analyzer the Right Features To Measure, Analyze And Control pH, Dissolved Oxygen And Temperature5 programmable onoff relays: 2 for pH, 2 for D.O. and 1 for temperature. Automatic temperature compensated (ATC) pH and D.O. readings. User selectable salinity and pressure compensated D.O. readings. Programmable hysteresis for customized control. RS-485 output for remote access via an IBM compatible computer. This allows multiple units to be connected, ganged, together. Simultaneous display of: pH, D.O., temperature, relay status and transmitter current mA output.Clear, bright LCD with manual backlight switch for added visibility in dark working conditions.Setup and calibration are done through a friendly, user-guided menu.Convenient pH calibration with automatic buffer recognition of US and European buffer sets. Calibration data is stored in memory and is ready for use on power up.