Compact, lightweight, and easy to install. Intuitive user interface Difficult IP55 accommodation Low cost of ownership due to minimal maintenance. The measurement ranges from 0 to 1% up to 0...25% O2 and 20/80/90...100% O2 Scale accuracy better than ±1% of full scale 2 x 4...20 mA outputs and Modbus RTU over RS485 as standard.