> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# USB Voltage Meter with OLED Display

**Type:** Product page · **SKU:** ADA2690 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/usb-voltage-meter-with-oled-display.html ([markdown](https://core-electronics.com.au/usb-voltage-meter-with-oled-display.html.md))

This USB In-Line Voltage and Current Meter with OLED Display is a lot like the Charger Doctor We carry - if the doctor was a talented surgeon who just lost her medical...

## Pricing

- **Price:** $36.50 (inc GST) — $33.18 AUD, exc GST
- **Quantity discounts:** 10+ $32.18 (exc GST) · 50+ $31.53 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 85 more in 8–12 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA2690:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA2690:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

This USB In-Line Voltage and Current Meter with OLED Display is a lot like the [Charger Doctor](https://core-electronics.com.au/usb-charger-doctor-in-line-voltage-and-current-meter.html) We carry - if the doctor was a talented surgeon who just lost her medical license and has nothing to lose. Just like the charger doctor, you can use this meter to find out if your voltage is too low or your current draw is too high.
 
 Use the USB In-Line Voltage and Current Meter to measure the working voltage and current output for any USB port and project. This blue plastic dongle plugs between a USB device, and passes the data lines through. There's a 0.025 ohm resistor in line with the power pin that is used to measure current draw. This voltage meter has an OLED display that shows off voltage, watts, amps, and mAH and instantly reads the numbers out for testing devices such as chargers, cables, and cell phones. There's a button on the back that allows you to flip the display 180° for easier reading.
 
 You can use this device from 3.7-13VDC input voltage (although most USB devices tend to hover around 4.75 to 5.25) and up to 3A of current. It's a very handy tool for testing USB devices above 7VDC, checking load levels and debugging battery chargers and boost converters. It's a little chunkier, but more numerical than [Adafruit's USB Power Gauge Mini-Kit](https://core-electronics.com.au/adafruit-usb-power-gauge-mini-kit.html). It's also not open source so check out the USB Power Gauge mini kit if you want to hack together your own power gauge indicator or Adafruit's [Charger Doctor ](https://core-electronics.com.au/usb-charger-doctor-in-line-voltage-and-current-meter.html)for a less expensive version that can handle less voltage.

### Technical Details

Dimensions:

- w/o USB Plug: 47mm x 22mm x 11mm / 1.9" x 0.9" x 0.4"
- USB Plug: 14mm / 0.6"
- Weight: 11.7g
 
Specifications:

- USB 1.x and 2.x - all data speeds. Does not have USB v3 pins so USB v3 connections will automatically downgrade to v2
- Working Range: 0~3A, 3.7~13VDC
- Resolution: 10mV / 10mA

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/2/6/2690-08.jpg)