FNIRSI FNB48P USB power meter — PD3.0 QC4+ PPS, voltage current capacity tester

The FNIRSI FNB48P is a compact, high-precision USB power meter and protocol tester designed for engineers, hobbyists, and anyone working with USB charging systems. It measures voltage, current, power, and capacity in real time while simultaneously identifying the active fast-charging protocol — including USB Power Delivery 3.0, Qualcomm Quick Charge 4+, and PPS (Programmable Power Supply). Small enough to fit in a pocket, it is an indispensable tool for testing chargers, cables, power banks, and USB-C devices.

Key Specifications:

• Voltage measurement range: 4V – 24V
• Current measurement range: 0 – 6A
• Power measurement: up to 144W
• Capacity measurement: mAh and mWh
• Supported fast charge protocols: USB PD 3.0, PD 2.0, QC 4+, QC 3.0, QC 2.0, PPS, AFC, FCP, SCP, VOOC, and more
• PD trigger function: yes — can trigger PD voltages (5V, 9V, 12V, 15V, 20V)
• Display: colour LCD
• Interface: USB-A input + USB-A/C output (pass-through)
• Data logging: yes
• Dimensions: compact / pocket-sized

Key Features:

• Multi-protocol detection — identifies QC4+, PD3.0, PPS, and 10+ other fast charge protocols automatically
• PD trigger — manually trigger specific PD voltages for testing PD-capable chargers and devices
• Real-time V/I/P/capacity display — monitor charging performance live
• Capacity accumulation — tracks total mAh and mWh delivered over a session
• Pass-through design — inline measurement without interrupting charging
• Compact and portable — lightweight, easy to carry in a toolkit or pocket

Applications:

• USB charger output testing and verification
• USB cable quality and resistance testing
• Power bank capacity measurement
• Fast charge protocol identification
• USB-C PD charger development and debugging
• Battery charging current monitoring