JPB-70A Portable Dissolved Oxygen Analyzer Water Quality Aquaculture Dissolved Oxygen Meter Detector Technical features: 1. Dot matrix backlit LCD display 2. Automatic temperature compensation, fast response time 3. Portable and easy to carry 4. Equipped with our own dissolved oxygen electrode (polarographic type coated type) Main Specifications: 1. Measuring range: Dissolved oxygen: (0.0～20.0) mgL, temperature: (0-40) degrees Celsius 2. Basic error: Dissolved oxygen: ±0.01mgL, temperature: ±1°C 3. Residual current: not more than 0.15mgL 4. Response time: no more than 30s (90% response at 20 degrees Celsius) 5. Range of automatic temperature compensation: (0-40) degrees Celsius 6. Adopt 1.5V LR44 button battery x 4 (not included in delivery) 7. Dimensions: 4×18.5 cm 8. Weight: 88 grams Packing list: 1. Host x1 2. One meter wire dissolved oxygen electrode x1 3. Electrode membrane cover x3 4. A reagent x1 (set) 5. Empty bottle spare x1 6. Certificate of conformity x1 7. Warranty card x1 8. Manual x1