2 line working voltage: 4.0~40V (with reverse protection function) 2 line detection voltage: 0.0~40V 3 line working voltage: 4.0~40V (with reverse protection function) 3 line detection voltage: 0.0~100V Working current: 20mA Display mode: 0.28 \LED, Mounting hole: 23 x 10 mm The measurement rate: more than 200mS/ times Measuring accuracy: 3 per thousand Limit working condition Low working voltage: +4.0V Maximum working voltage: +40V Working temperature: -10 ~ +65 Working humidity: 10 ~ 80% (no condensation) Working pressure: 80 ~ 106kPa No direct exposure to sunlight