Hach pH Electrode

Hach sensION156 Meter provides multi-parameter confidence in one single instrument. Measures pH, Dissolved Oxygen, Conductivity, TDS, Salinity and Temperature. Includes Gel-Filled pH electrode and Dissolved Oxygen-DO probe. All-in-one 5-pin connector for easy determination of temperature and your chosen parameter. Measures/compensates temperature in °C or °F. Built-in barometer for DO samples. Can calibrate with either NaCl or KCl. 
The sensION meter has user-activated calibration review with time and date stamps for GLP. The unit autocorrects for altitude, barometric pressure, and salinity. 
Resolution to 0.1, 0.01, 0.001; for the right accuracy when you need it. Backlit screen for easy night-time sampling. Easy to clean keypad. Automatic buffer recognition with 4.01, 6.86, 7.00 and 10.01 buffers. Many color-coded buffers to choose from.