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Compact rectangular USB meter tester with colour display and integrated USB-A connectors, matte black finish

RD UM34/UM34C USB Meter Tester 4A QC2.0 QC3.0 Apple 2.4A Electrical System Tool

SKU CH-RK75-PASJ3 MPN UM34/UM34C

Measures USB-A voltage, current, capacity and cable resistance, supports QC2.0, QC3.0 and Apple 2.4A protocols, and fits in a 71 by 32 by 12.5 mm case

  • FeaturesBattery Powered, false
  • Height71 L x 32 W x 12.5 H millimeters
  • Width71 L x 32 W x 12.5 H millimeters
  • Length71 L x 32 W x 12.5 H millimeters
  • Tests charger voltage and current up to 4A
  • Measures power bank capacity and cable resistance
  • Identifies QC2.0 QC3.0 Apple 2.4A Samsung protocols
  • Bluetooth APP control on UM34C model
  • Compact 71 x 32 x 12.5 mm design

USB Meter Tester for QC and Apple Protocols

The RD UM34 and UM34C are compact USB-A and USB-C meter testers that measure voltage, current, power and cable resistance. They support Quick Charge 2.0 and 3.0 plus Apple 2.4A, 2.1A, 1A and 0.5A recognition modes. The UM34C adds Bluetooth connectivity for APP data logging and control while the UM34 operates without communication features.

Suits Charger and Cable Diagnostics

This tool suits technicians and hobbyists who need to verify charger output, check power bank capacity or measure USB cable resistance using the dual Micro-USB and USB-C input ports. It does not suit users who require automated data export without a smartphone, because the UM34 lacks any communication interface and the UM34C relies on a Bluetooth APP connection.

±0.2 % Voltage Accuracy Decides Fit

Voltage measurement accuracy is specified at ±0.2+1 digit and current accuracy at ±0.8+3 digits. These tolerances determine whether the meter meets the precision required for your calibration or quality-check workflow. If tighter limits are needed, this model will not satisfy the requirement.

Highlights

  • Tests charger voltage and current up to 4A
  • Measures power bank capacity and cable resistance
  • Identifies QC2.0 QC3.0 Apple 2.4A Samsung protocols
  • Bluetooth APP control on UM34C model
  • Compact 71 x 32 x 12.5 mm design

Specifications

BrandRD, HANGZHOU RUIDENG TECHNOLOGY CO., LTD
FeaturesBattery Powered, false
Height71 L x 32 W x 12.5 H millimeters
Width71 L x 32 W x 12.5 H millimeters
Length71 L x 32 W x 12.5 H millimeters

Questions about this item

What comes in the box and do I need a separate Bluetooth module for the UM34C?

The UM34C includes built-in Bluetooth for app connectivity while the UM34 has no communication hardware. Both units have a USB-A input, USB-A output, USB-C input and Micro-USB port for cable resistance checks. No extra modules are required.

Which model should I choose if I want to log charge data on my phone?

Choose the UM34C; it connects to the companion app via Bluetooth so you can view and control measurements on a smartphone. The UM34 lacks any communication capability and works only from its own screen.

What do the stated accuracy figures of ±0.2+1 digit for voltage and ±0.8+3 digits for current mean in practice?

At a typical 5 V reading the meter shows the true voltage within ±0.2 V plus one count, and at a 2 A reading the true current is within ±0.8 A plus three counts.

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