测量范围:0.0~20.0mg/L 测量精度:±0.5mg/L
测量范围:0.0 to 50.0 mg/L;0 to 600%;-5.0 to 50.0 °C 精度:读书的±1%
测量范围:±1000 mV, 测量精度:±5 mV