Main technical specifications (1) Measuring range: 20 ppm to 5% (2) Repeatability (r): <0.02894 (X+0.1691) (3) Reproducibility (R): <0.1215(X+0.5555) (4) Detection limit: 7 ppm (5) Oil sample quantity: 2.5 ml (it is equal to sample depth of 4.5 mm) (6) Measurement time: it can preset 60, 120, 240, 300, and 600 s at random (7) It can make measurement automatically for single sample. Repeat times: can set 2, 3, 5, 10, and 50 at random; it will show average value and standard deviation at end of measurement. (8) Calibration curve numbers: it can save 9 calibration curves. 5 pieces of them are unary linear equation and 4 pieces of them are unary quadratic equation. (9) Working condition: Ambient temperature: 5~40ºC Relative humidity: ≤85% (30 ºC) (10) Power supply: AC 220V±20V, 50 Hz; Rated power: 30 W (11) Dimension and weight: 468mm×368mm×136mm; 13 kg