Specifications:Brand new and high quality. Measuring range: DC 0V--30V. Input range: DC 4.7V-30V(Max Input: DC 30V. The device can be damaged if input is over 30V). Working Current:< 18mA Display Color: Blue. Display: Three 0.56 "digital tube. Measurement accuracy: Â±1%. Refresh rate: about 300mS / times. Input impedance: > 100K. Operation Temp: -10â„-+65â„. Size:2.8cm x 4.7cm x 2.1cm.