These half-cell electrodes have BNC connectors and must be used with reference electrodes, available as 05990-60 or 05899-25. Both of these electrodes are made of blue sensing glass, have a 212°F (100°C) maximum temperature and are 154 mm long by 12 mm in diameter. Model 05990-15 is for general purpose pH use and 05990-16 is for general purpose ORP measurment.

Note: half-cell electrodes must be used with reference electrodes.