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Compact rectangular USB-C tester with colour IPS screen and buttons

KJ-KayJI USB C Tester 2-in-1 IPS Digital Multimeter 3A Discharge Load (2024) electrical system tool

SKU CH-WMFP-87KFC

Measures voltage, current, power, resistance, capacity, temperature and charging time for USB-C and USB-A devices, with a 3 A discharge load for power-bank capacity testing

  • Key featuresPd2.0/Pd3.0, Qc2.0/Qc3.0, Bc1.2, Nist Traceable, Battery Pow
  • Overall height8.2 L x 6.2 W x 1 H centimeters
  • Overall width8.2 L x 6.2 W x 1 H centimeters
  • Overall length8.2 L x 6.2 W x 1 H centimeters
  • Product typeMultimeters, Tach & Dwell Meters
  • Measures voltage, current, power, resistance, capacity and temperature across USB-C and USB-A connections
  • IPS colour display with 9 interface screens and 180-degree rotation for clear viewing
  • Built-in 3 A discharge load tests power-bank and phone capacity with 90 % efficiency factor
  • Supports PD 2.0, PD 3.0, QC 2.0, QC 3.0 and BC 1.2 fast-charge protocols
  • Compact 8.2 × 6.2 × 1 cm battery-powered unit calibrated to NIST-traceable standards

USB-C tester with 3 A discharge load

The KJ-KayJI 2-in-1 IPS digital multimeter measures voltage, current, power, resistance, capacity, temperature and charging time on USB-C and USB-A ports. It supports PD 2.0, PD 3.0, QC 2.0, QC 3.0 and BC 1.2 fast-charge protocols. The unit includes a 3 A discharge load for power-bank capacity testing and a 180-degree flip IPS colour screen. It is aimed at technicians and hobbyists who need detailed USB power analysis.

Capacity measurement and headroom

The tester logs capacity in mAh and energy in Wh across multiple data groups. A 90 % multiplier is applied to power-bank discharge results to estimate usable capacity, while phone battery estimates use a 3.75 V divisor and the same 90 % factor. The 3 A discharge load sets the practical upper limit for constant-current drain tests; higher-current sources will exceed the built-in load capability.

USB-C and USB-A interface limits

The device operates within the electrical limits of the supported PD, QC and BC 1.2 specifications. It cannot trigger PD charging on a USB-C port unless an OTG or micro-USB adapter is connected to the tester's micro-USB input. Screen rotation is limited to a dedicated 180-degree flip mode. The tool does not support protocols or power levels beyond the listed standards.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $31.99
Typical for this category: the median of 971 items is $30.99.

Specifications

Product
Brand nameKJ-KayJI
Product typeMultimeters, Tach & Dwell Meters
Size & build
Overall height8.2 L x 6.2 W x 1 H centimeters
Overall width8.2 L x 6.2 W x 1 H centimeters
Overall length8.2 L x 6.2 W x 1 H centimeters

Questions about this item

Will the KJ-KayJI USB C Tester work with my existing Micro-USB cables and USB-A chargers?

Yes, the tester supports Micro-USB cables, USB-A to USB-C cables, USB-C to USB-C cables, USB-A chargers and USB-C chargers.

How can I verify the KJ-KayJI USB C Tester is measuring correctly after I connect it?

If current shows at no load, hold the button while inserting the device to calibrate to zero; the IPS colour screen then displays voltage, current, power, resistance, capacity, temperature and timing across nine switchable interfaces.

What accessories come in the box with the KJ-KayJI USB C Tester and what must I provide?

The tester includes a Micro-USB input port for OTG or Micro-USB cable connection to trigger PD charging; cables, chargers and power banks are not included.

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