精度 | ±0.8%VOL | ±10ppm(0-199ppm) ±5%测量值(200-2000ppm) ±10%测量值 (2000-10000ppm) | ±2ppm(0-39.9ppm) ±5%测量值(40-500ppm) | ±5ppm(0-99ppm) ±5%测量值(100-4000ppm) | ±2ppm(0-39.9ppm) ±5%测量值(40-300ppm) | ±5ppm(0-99.9ppm) ±5%测量值(100-500ppm) | ±5ppm(0-99ppm) ±5%测量值(100-5000ppm) | ±3%VOL+1%测量值(0-25%VOL) ±0.5%VOL+1.5%测量值(>25%-50%VOL) | ±2ppm(0-39.9ppm) ±5%测量值(40-300ppm) |