Specification of (0.28" LED Voltmeter Ammeter 100V 10A version) Working voltage:4-30V DC Note: The maximum input voltage can not exceed 30V, otherwise there is the danger of burning Display: 0.28" Two color blue and red Measuring range: DC 0-100V 0-10A Minimum resolution (V): 0.1V Refresh rate: 100mS / times Minimum resolution (A): 0.01A Operating temperature: -15 to 70c Working preure: 80 to 106 kPa Wiring: Black line (thin): vacant or buck circuit (module) negative Red line (thin): power supply+ Black line (thick): COM, common measuring Red line (thick): PW+, measuring terminal voltage input positive Yellow line (thick): IN+, current input+ (Please refer to the wiring diagrams for more details) Specification of (Voltmeter Ammeter DC 4.5-30V version): Type :2 Wire Measuring range: 4.5-30V Allowable error: accurate to 0.01V below 10V, accurate to 0.1V above 10V, allowable error of 1% (+/-1 words) Display mode: 3-digit 0.56 LED digital tube Display color: Red/Green/Blue (Optional) Refresh rate: about 200mS/time Power supply: No required Current consumption: le than 20mA, generally 5-15mA Working temperature: -10C~65C Dimensions:48 x 29 x 16mm / 1.89 x 1.14 x 0.63inch Opening size: 46x27mm / 1.81 x 1.06inch Lead length :20cm / 7.9inch Precautions: 30V is the voltmeter's maximum operating limited voltageplease leave enough margin when workingto avoid voltmeter's permanent damage because of electrical spark power supply rippleor other too high abrupt change of voltage. Package included: 1 piece P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 Buyer show 1 2 3 4 5 6