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KLEIN ET900 USB Digital Meter, USB

Manufacturer: Klein Tool | Catalog # ET900 | North Coast Part # 1580682

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The Klein Tools ET900 is a USB digital meter for common standard USB-A (Type A) ports including Qualcomm Quick ChargeĀ® ports. It accurately and reliably measures and displays the USB port voltage, current, capacity, energy, and resistance simultaneously. It can function with any USB-A port that has the ability to deliver power. It requires NO batteries as it draws power from the power source to function.

Technical Information

USB Port Voltage, Current, Capacity, Energy and Resistance (Calculated)
3 Amp
400 ohms Maximum
USB-A (Type A)
20 Volt

Manufacturer Information

Family Brand Name
Klein Tools

General Product Info

Product UPC
1.10 oz


0.56 Inch
Overall Length
2.84 in
1.25 in

Certifications and Compliance

CA Prop65 Warning
WARNING: Cancer and Reproductive Harm See for more information.
  • Durable cable to allow easy access to hard-to-reach ports
  • Built to withstand a 6.6-Foot (2m) drop
  • Hi-resolution LCD for clear visibility in environments with low ambient lighting
  • No batteries needed; powered by the USB port being tested
  • Store and recall up to 10 readings
  • Voltage and current overload detection
  • 3 to 20V DC; Current: 0.05 to 3A
  • Continuously monitor up to 1000 hours of voltage, current, capacity/charge delivered, energy, and resistance (calculated)
  • Rugged, pocket-sized, and light weight Klein industrial design stands up to jobsite demands
  • Tests most common standard USB-A ports, including Qualcomm Quick Charge® ports
  • Do NOT use during electrical storms or in wet weather. Do NOT use if meter appears damaged. Use caution when working with voltages above 25V RMS or 24V DC. Such voltages pose a shock hazard.
  • This meter will NOT display current below 50 milliamperes, even if it is allowing this to pass through. NOTE: The display will show zero current.
  • To ensure safe operation and service of this meter, follow all instructions. Failure to observe warnings can result in severe injury or death.
  • Do NOT use with ports that operate outside of the rated voltage and current. NEVER use on a circuit with voltage or current that exceeds the maximums specified for this device.