Is your charger really putting out 65W? This gadget gives you all the answers in real time.
Digital USB Tester - FNIRSI/RD
A compact device that connects in-line with the charging path and displays all the electrical data on a color LCD screen: voltage, current, power, and charging protocol.
Average price: $15-$25 (depending on the model and measurement accuracy)
📋 Technical Specs & Data
Voltage range:4V - 30V
Current range:0A - 5A
Supported standards:PD 2.0/3.0, QC 2.0/3.0, PPS
Display:TFT Color 0.96 inch
Connectors:USB-A / USB-C
✅ Pros and Cons
What we liked:
Very high measurement accuracy.
Automatically detects the charging protocol (PD/QC).
Shows temperature and cable resistance.
What we liked less:
Interface packed with data for non-technical users.
Requires a quality cable so as not to skew results.
💡 Why is this a must-have tool for every IT person?
Instead of guessing why a laptop or phone is charging slowly, connect the tester. If the voltage is fine but the current is low - the problem is the cable. If the voltage drops - the problem is the charger. A huge time saver for diagnostics.
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