KitsGuru Yellow LED 5 Digit DC 0-4.3000-33.000V Digital Voltmeter Voltage Meter Car Panel Voltmeter  (Digital)

Flexible supply:There is no need to isolate power supply, you can use the system common ground.(Note: If you need 0.1 mV resolution please use isolated power supply. Otherwise the accuracy drop an order of magnitude Variable precision:Precision automatic change below 4.3 V, the highest resolution of 0.1 mV, Precision automatic 4.3 V above changes, the highest resolution of 1 mV Connection is simple, just need to pick up two lines, a joint reverse protection, then do not burn. 1. Weight: 16g 2. Display mode: Five 0.36 LED digital tube 3. update rate: > 3s/time 4. Physical size: 48 x 29 x 22 mm (L*W* H) 5. Opening size: 45 x 26 mm (L*W) 6. Supply voltage: 3.5-30V 7. Lead wire length: 14 cm 4 lines 8. Measurement range: DC 0-4.3000-33.000V 9. Operation temperature: -10 degrees~65 degrees 10. Measurement accuracy: (0.3 + 2words) {means the table worst case maximum error of less than 10 mv normal within error 2mv} 11. Red line 1:Power Supply + Black line 1:Power Supply 12. Red line 2:VIN + Black line2: VIN