Key features: 1.Optical technology; no need for electrolyte and membrane changes 2.Short response time and excellent long-term stability 3.Applicable for a wide range of concentrations and temperatures 4.Highly accurate and virtually maintenance-free 5.Sturdy aluminum housing (ip 65) Key specifications: 1.Liquid phase measuring range: i) 1 ppb â?? 2 ppm or ii) 30 ppb â?? 35 ppm 2.Liquid phase accuracy : i) â± 1 ppb or ii) â± 30 ppb 3.Gas phase measuring range: i) 0 â?? 4.2 % o2 or ii) 0 â?? 50 % o2 4.Gas phase accuracy: i) â± 0.002 % o2 or ii) â± 0.03 % o2 5.Response time: t90 â?¤ 10 s 6.Material: 1.4404/aisi 316l, silicone (fda), ptfe (fda) 7.Datalogging: manual and automatic with a logging time of 5 to 600 seconds; approx. 5, 000 measurement values; pc software and usb-interface 8.Power supply: battery operated