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This is a standalone Red LED DC voltage meter. It measures 4.5V-30V with 1% accuracy. Best suitable for battery-level display. Just apply two wires on the power without any extra circuits or components, it gives the reading straight away. Easy to use, and good company with robot application
LED Voltage Meter Red specifications
Measuring range: DC 0V--30V.
Input range: DC 4.5V-30V(Max Input: DC 30V. The device can be damaged if the input is over 30V).
Working Current: < 23mA.
Display Color: RED.
Display: Three 0.56 "digital tubes.
Measurement accuracy: 1%.
Refresh rate: about 300mS / times.
Input impedance: > 100K.
Operation Temp: -10 to +65C
Size:2.8cm x 4.7cm x 2.1cm.
Wiring:
Red: power supply +. can power meter with 9V pos pin
Black: power supply - can power meter with 9V neg pin
White: measure +. will measure volts up to 30V.
Datasheet:https://cdn.shopify.com/s/files/1/0647/7702/7824/files/Volt_Meter.pdf?v=1656573125