This WTW Handheld Oxygen Meter Oxi 315i is in real good condition and guaranteed to functions 100%. It came from a local lab that was upgrading equipment and we can accept pay pal or your credit card. Please contact me with any questions. handheld oxygen meters are both dustproof and waterproof as well as being submersible. The large clear display with operator guidance allows the measurements to be read off unambiguously and comfortably. The silicone keys with tactile answerback guarantee simple operation Simple, robust handheld meter with simplified keypad, without memory function and with no manual input facilities; together with DurOx 325 particularly suitable for use in aeration tanks Model Oxi 315i Oxi 330i Oxi 340i Measuring range/ O2 concentration 0.00 ? 19.99 mg/l (19.9 mg/l*) O2 concentration 0.00 ? 19.99 mg/l (19.9 mg/l*) resolution 0.0 ? 90.0 mg/l (90 mg/l*) 0.0 ? 90.0 mg/l (90 mg/l*) O 2 saturation 0.0 ? 199.9% (199%*) O2 saturation 0.0 ? 199.9% (199%*) 0 ... 600% 0 ? 600% O 2 part. press. 0,0 ? 199.9 mbar (199 mbar*) 0 ... 1250 mbar Temperature -5.0 ? +50.0 C Temperature -5.0 ? +50.0 C *if DurOx oxygen sensor is used *if DurOx oxygen sensor is used Accuracy O2 concentration 0.5% of value O2 concentration 0.5% of value (1 digit) O2 saturation 0.5% of value O2 saturation 0.5% of value O 2 part. press. 0.5% of value Temperature 0.1 K Temperature 0.1 K Temperature 2% at 0 ... +40 C compensation Air pressure Automatic with built-in pressure sensor (500 ... 1100 hPa) compensation Salinity correction 0 or 35.0 solid SAL Automatic from 0.0 ... 70.0, adjustable via display Display LCD display 60 x 45 mm visible area, simultaneous display of measurement, temperature, special characters Sensor evaluation Depends on calibration results, shown on display Calibration alarm 1 ... 999 days, adjustable AutoRead For reproducibility better than 0.05 mg/l Calibration OxiCal rapid calibration in OxiCal-SL or OxiCal-D Calibration ? GLP-conform calibration protocol; protocol last protocol stored in memory Data storage ? 500 data sets (measurement, temperature, date/time, identity no.); time-controlled storage at intervals 5 s ... 60 min, non-volatile data storage (even when changing batteries) Data output Via display Via display or interface Interface ? Self-configuring analog output 0 ... 2 V corresponding to display, or RS 232 bi-directional interface Operating time 2000 hours with normal 4 x 1.5 V batteries (AA) Continuous operation from mains with AutoSwitchOff after 1 h (except logger operation) supply; 2000 hours with battery operation with AutoSwitchOff after 1 h (except logger operation) Protection type IP 66 and IP 67 to IEC 529 Dimensions 172 x 80 x 37 (H x B x D) Weight Approx. 300 g Certified to CE, TÜV/GS, UL and/or cETLus, CUL Track Page Views With Auctiva's FREE Counter