Plugable USBC-VAMETER3 vs Klein ET920

Choose the Plugable USBC-VAMETER3 for a simple USB-C power display, especially EPR laptop charging up to 240 W: it shows live volts, amps, calculated watts and current direction. Choose the Klein ET920 for USB-A as well as USB-C, delivered-energy totals and 10 saved readings, provided the connection stays within its 20 V ceiling. Plugable specifications, Klein specifications.

Quick picks and comparison

EPR or live watts: Plugable. Mixed USB connectors or session totals: Klein. If you need advertised charging profiles or cable wiring information, continue to the specialist guides linked below.

Compare specifications and all conditions

Connections

Plugable USBC-VAMETER3

USB-C; bidirectional

Klein ET920

USB-A or USB-C; matching input/output only, one side at a time

Voltage range

Plugable USBC-VAMETER3

4.5–50 V

Klein ET920

3–20 V DC

Current range

Plugable USBC-VAMETER3

50 mA–6.5 A operating range

Klein ET920

0.05–3 A USB-A; 0.05–5 A USB-C

EPR charging

Plugable USBC-VAMETER3

Up to 240 W; 48 V, 5 A

Klein ET920

Outside its voltage range

Live display

Plugable USBC-VAMETER3

Volts, amps, calculated watts, current direction

Klein ET920

Volts, amps, charge, energy, calculated resistance and elapsed time

Accumulated energy

Plugable USBC-VAMETER3

Not documented

Klein ET920

Wh and mAh totals

Saved readings

Plugable USBC-VAMETER3

Not documented

Klein ET920

Up to 10, saved manually

Display control

Plugable USBC-VAMETER3

OLED; button rotates screen 180 degrees

Klein ET920

LCD; Mode button selects memory and stores/clears readings

Full comparison table ↔

Swipe to compare. Row labels stay visible.

What matters	Plugable USBC-VAMETER3	Klein ET920
Connections	USB-C; bidirectional	USB-A or USB-C; matching input/output only, one side at a time
Voltage range	4.5–50 V	3–20 V DC
Current range	50 mA–6.5 A operating range	0.05–3 A USB-A; 0.05–5 A USB-C
EPR charging	Up to 240 W; 48 V, 5 A	Outside its voltage range
Live display	Volts, amps, calculated watts, current direction	Volts, amps, charge, energy, calculated resistance and elapsed time
Accumulated energy	Not documented	Wh and mAh totals
Saved readings	Not documented	Up to 10, saved manually
Display control	OLED; button rotates screen 180 degrees	LCD; Mode button selects memory and stores/clears readings

What matters	Plugable USBC-VAMETER3	Klein ET920
Connections	USB-C; bidirectional	USB-A or USB-C; matching input/output only, one side at a time
Voltage range	4.5–50 V	3–20 V DC
Current range	50 mA–6.5 A operating range	0.05–3 A USB-A; 0.05–5 A USB-C
EPR charging	Up to 240 W; 48 V, 5 A	Outside its voltage range
Live display	Volts, amps, calculated watts, current direction	Volts, amps, charge, energy, calculated resistance and elapsed time
Accumulated energy	Not documented	Wh and mAh totals
Saved readings	Not documented	Up to 10, saved manually
Display control	OLED; button rotates screen 180 degrees	LCD; Mode button selects memory and stores/clears readings

Sources: Plugable product page and FAQ, ET920 manual. “Not documented” means the cited maker documents do not describe that function; we have not inferred it from a product nickname such as “USB multimeter.”

• 240 WPlugable's supported EPR charging ceiling
• 10 readingsKlein's manually saved memory slots

Choose the Plugable USBC-VAMETER3 for USB-C and EPR

The Plugable is our pick when the question is “How much charging power is flowing right now?” Its display supplies watts directly, and its direction indicator is useful when either connected device might supply power. Plugable says the meter is bidirectional, so either end can face the source. Its side button flips the display for readability. Setup instructions.

Separate the operating range from the charging specification: 6.5 A is the stated operating-current upper bound, while Plugable describes EPR charging at up to 48 V, 5 A and 240 W. Do not multiply the separate operating ceilings to invent a higher supported charging rating. The listed box contents are the meter alone; plan to use your own suitable charging/data cable. Specifications and box contents.

The buying trade-off is straightforward: Plugable documents a live display, without an energy accumulator or saved-reading function. Choose Klein if the result you want is a session total. Plugable display description.

Check price on Amazon

Choose the Klein ET920 for mixed USB connectors and totals

The ET920 suits a drawer containing USB-A charging accessories alongside USB-C devices. It has attached source-input leads and corresponding output ports; Klein specifies approximately 100 mm of cable. You still need the device's charging lead downstream. These attached leads are part of the meter, rather than a supplied USB-A-to-USB-C conversion cable. Klein connection diagram and package comparison.

It records delivered charge and energy, with display maxima of 99,999 mAh and 999 Wh, and elapsed time up to 999 hours, 59 minutes, 59 seconds. The manual qualifies these maxima as based on the display layout. Treat them as instrument limits, rather than a promise about a particular power bank's usable capacity. ET920 manual.

Klein's display diagram does not show a dedicated live-watts field. For instantaneous power, multiply the displayed voltage by current; Plugable explains the formula as P = V × I. Wh is accumulated energy, so it answers a different question from live W. Klein display labels, Plugable's wattage explanation.

Check price on Amazon

Buying guide: build the source-to-meter-to-device connection

Choose the complete connection before ordering. The paths below describe power flow; follow the cable and device makers' ratings as well as the meter's limits.

The matching-connector paths come from Klein's monitoring instructions; the reversible USB-C path comes from Plugable's setup instructions. USB-IF specifies the EPR voltages and updated cable requirements. Confirm the charger, cable and device support your intended mode; inserting a meter does not make them an EPR setup.

For the ET920, use this connection order from its manual:

1. 1

   Choose one connector side

   Match USB-A input to USB-A output, or USB-C input to USB-C output; leave the other side disconnected.

2. 2

   Connect the source first

   Plug the corresponding attached input lead into the powered source.

3. 3

   Connect the device second

   Attach its cable to the matching output. On USB-C, the downstream device must be connected for the display to turn on.

Plugable likewise says its display normally needs devices connected at both ends. A dark screen with just one end attached is therefore insufficient evidence of a failed source. Plugable power-on notes.

Energy totals, saved readings and reset traps

Klein's memory holds manually saved snapshots. During live monitoring, hold Mode for 3 seconds to save a reading; the slot flashes. Repeated saves fill the available locations, then overwrite the earlier records starting at the first slot. Press Mode to access memory and cycle through stored readings. This is not a documented automatic recording interval or computer-export workflow. Mode-button instructions.

Two resets serve different purposes. Holding Mode for 5 seconds from the Memory screen clears stored readings. Separately, the manual says mAh resets only when the source is disconnected. Do not assume clearing saved records starts a fresh charge total, or that reconnecting will resume every live total; the instructions do not give a separate Wh-resume guarantee. Reset instructions.

For a useful session record, note the charger, cable, device, connector side, delivered Wh and elapsed time, and save or photograph the result before disconnecting. Interpret those as USB-side delivery readings at the meter; they do not independently measure the battery's stored energy. This recommendation follows Klein's description of the fields as charge delivered and energy delivered in its manual.

Data and video: respect the documented pass-through limits

Plugable says it leaves data lines untouched, supports USB data through USB 3.1 Gen 2, and passes USB-C Alternate Mode video; its port table specifies 10 Gbps. It explicitly excludes Thunderbolt 3 devices. Choose it for the documented USB/Alt Mode connection, without extending that promise to every faster dock sharing the same connector. Plugable compatibility notes.

Klein's cited product page and manual specify power measurements without a data-speed or video pass-through guarantee. That omission does not establish that data is blocked. For a storage or display link, get compatibility confirmation from Klein before buying it for that role. ET920 specifications.

Low-current readings and accuracy: what the display cannot settle

Zero on the ET920 does not prove zero consumption. Klein explicitly says current below 50 mA can pass while the display shows zero. Plugable's specified operating range also starts at 50 mA, but its documentation does not make the same zero-display statement. Neither specification supports choosing these meters to quantify smaller standby currents. Klein warning, Plugable operating range.

Accuracy figures also need their qualifications. Plugable reports readings within ±3% at 20 V in the maker's own comparison with a professional multimeter. Klein's manual prints ±1% (±2 Bytes) for voltage and current; it does not explain “Bytes.” We would not turn those differently qualified statements into a universal accuracy ranking. Plugable accuracy FAQ, Klein accuracy specification.

USB-IF explains that Power Delivery lets devices take only the power they require. A lower wattage by itself therefore does not establish a faulty charger or cable. Neither meter's cited documentation describes charger-profile enumeration or a cable wiremap: use our USB-C power-meter and analyzer guide for the former, and USB cable tester guide for physical cable checks. USB-IF explanation.

Check the exact model before ordering

The original USBC-VAMETER is a different generation: Plugable describes it as PD 3.0, 5–20 V, up to 5 A and 100 W, versus the USBC-VAMETER3's PD 3.1 EPR, up to 48 V and 240 W. Check the full model name if EPR is the reason you are buying. Plugable model comparison.

Klein's ET900 and ET910 are USB-A-only models in its comparison brochure. The ET910 adds built-in fixed test loads; do not transfer that feature to the ET920. For these two picks, include your compatible charger, device and downstream cable in the buying checklist.

How we choose

This comparison is based on manufacturer documents, without physical product measurements. We checked the two product pages, Klein's matching manual and connector diagrams, Plugable's model and accuracy FAQs, and USB-IF's Power Delivery explanation. We prioritized a connection that fits the stated limits, a display that answers the intended question, and clear distinctions between saved snapshots, energy totals and unsupported diagnostic claims. Our measurement policy explains how future instrument readings will be reported.

Verdict

Buy the Plugable USBC-VAMETER3 for USB-C live watts, bidirectional use and EPR charging. Buy the Klein ET920 for mixed USB-A/USB-C checks and accumulated energy with saved readings, inside its voltage limit. Choose an analyzer or cable tester instead when the unresolved question is protocol negotiation or cable wiring.