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Plugable USB-C Voltage and Amperage Meter (USBC-VAMETER3, 240W EPR)

A thumb-size inline USB-C meter that shows volts, amps, watts and the direction of current on an OLED screen while passing data, video and USB PD 3.1 EPR power up to 240 W.

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Plugable USBC-VAMETER3 connected between a USB-C power supply and a cable on a wooden desk, displaying voltage, current and wattage.
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Photo: Plugable

Key facts

Operating range
4.5 to 50 V, 50 mA to 6.5 A
USB PD
Passes USB PD 3.1 Extended Power Range (101 to 240 W); ports rated 48 V, 5 A, 240 W
Data and video
Passes USB data (USB 1.1 through 3.1 Gen 2, 10 Gbps) and USB-C Alternate Mode video
Display
OLED with volts, amps, calculated watts and current direction; a button flips it 180°
Connectors
USB-C plug and USB-C receptacle; works in either direction
How it measures
Taps only the power (VBUS) and ground lines; Plugable says it shouldn't interfere with data, Alt Mode video or charging
Thunderbolt
Not compatible with Thunderbolt 3 devices

Why people pick it

  • Passes 240 W EPR charging, 10 Gbps data and Alt Mode video while it measures
  • Shows which way current flows, and works in either direction
  • About the size of a flash drive; fits most phones in a case

Know before you buy

  • Shows volts, amps, watts and direction only: Plugable lists no energy totals, PD profile readout or e-marker test
  • Plugable reports readings within +/- 3% of the true value at 20 V in its own testing and says it isn't a substitute for professional USB-C test equipment
  • Not compatible with Thunderbolt 3 devices

Full specifications

Operating range4.5 to 50 V, 50 mA to 6.5 A
USB PDPasses USB PD 3.1 Extended Power Range (101 to 240 W); ports rated 48 V, 5 A, 240 W
Data and videoPasses USB data (USB 1.1 through 3.1 Gen 2, 10 Gbps) and USB-C Alternate Mode video
DisplayOLED with volts, amps, calculated watts and current direction; a button flips it 180°
ConnectorsUSB-C plug and USB-C receptacle; works in either direction
How it measuresTaps only the power (VBUS) and ground lines; Plugable says it shouldn't interfere with data, Alt Mode video or charging
ThunderboltNot compatible with Thunderbolt 3 devices
Power-onNeeds a device on both ends; if it lights with one end connected, that port is 'VBUS hot'
Size6.43 × 2.3 × 1.22 cm (2.5 × 0.9 × 0.5 in)
Weight10.9 g (0.4 oz)
Warranty2 years

From manufacturer documentation, checked November 2, 2026. Spotted an error? Tell us.

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