Specifications:Brand new and high quality. Measuring range: DC 0V--30V. Input range: DC 4.5V-30V(Max Input: DC 30V. The device can be damaged if input is over 30V). Working Current: < 23mA. Display Color: RED. Display Mode: Three 0.36 "digital tube. Measurement accuracy: Â±1%. Refresh rate: about 300mS / times. Input impedance: > 100K. Pitch of holes:28mm. Aperture size :2.8mm. Operation Temp: -10â„-+65â„. Size:2.2cm x 1.4cm x 1cm.