YSI Pro20 dissolved oxygen ( DO) meter

Pro20 Instrument General SpecificationsBarometer Built-in barometer Cable Lengths* 1- 4- 10- 20- 30- and 100-m lengths ( special order up to 100-m) ( 3.28, 13.1, 32.8, 65.6, 98 ft.) Certifications RoHS, CE, WEEE, IP-67, 1-meter drop test Connector MS ( military spec) waterproof with bayonet lock Data Memory 50 data sets Dimensions 8.3 cm width x 21.6 cm length x 5.6 cm depth ( 3.25 in x 8.5 in x 2.21 in) Languages English, Spanish, German, French Power 2 alkaline C-cells providing 450 hours of battery life; low battery indicator Salinity Input Range 0-70 ppt; manual ( automatically compensates for manual input value) Waterproof : IP-67 ( even with the battery cover off) Weight with Batteries : 475 grams ( 1.05 lbs) Pro20 System Specifications ( Instrument with Cable & Probe) Specifications: Range: Dissolved Oxygen: 0% to 500% air saturation; 0 to 50 mg/ L; -5º C to 45º C; Temperature: -5º C to 45º C. Resolution: Dissolved Oxygen: 0.1% air saturation or 1% selectable; 0.01 mg/ L or 0.1 mg/ L selectable; 0.1º C; Temperature: 0.1º C. Accuracy: Dissolved Oxygen: 0% to 200% : ± 2% air sat. or ± 2% of reading, whichever is greater; 200% to 500% : ± 6% of reading; 0 to 20 mg/ L; ± 0.3 mg/ L or ± 2% of reading, whichever is greater; 20 to 50 mg/ L: ± 6% of reading; ± 0.3º C; Temperature: ± 0.3º C. Range 400 to 999.9 mmHg, Accuracy ± 5 mm Hg within ± 5° C temperature range from calibration point, Resolution 0.1 mm Hg