<h2>USB Power Tester – Voltage &amp; Current Display Meter with Reset Function</h2> <p>Keep your USB devices, wall adapters, car chargers, and power banks performing at their best with this compact <strong>USB Power Tester</strong>. Featuring a clear digital display and a handy reset button, it lets electronics enthusiasts, DIY builders, and repair technicians quickly verify voltage and current output with precision and confidence.</p> <h3>Key Features</h3> <ul> <li> <strong>Wide Measurement Range:</strong> Measures voltage from 4 V to 20 V (±1% accuracy) and current from 0 A to 3.3 A — ideal for USB-A chargers, power banks, car adapters, and lab bench supplies.</li> <li> <strong>High Resolution Digital Display:</strong> Reads voltage to 0.01 V resolution for precise monitoring of USB power output in real time.</li> <li> <strong>Reset Button:</strong> One-press screen reset clears accumulated readings instantly, while memory retention keeps your last reading safe after power is disconnected.</li> <li> <strong>Input &amp; Output Indicators:</strong> Dual voltage/current indicators give you a full picture of what's going in and coming out of any USB power source.</li> <li> <strong>Compact ABS Construction:</strong> Lightweight and durable ABS body (approx. 7.22 cm / 2.84 in) slips easily into a tool bag, workshop drawer, or car glove box.</li> <li> <strong>CE Certified:</strong> Meets CE safety standards for reliable everyday use.</li> <li> <strong>Broad Compatibility:</strong> Works with USB wall chargers, car adapters, portable power banks, and other USB power sources up to 20 V.</li> </ul> <h3>Specifications</h3> <table> <tbody> <tr> <td><strong>Voltage Range</strong></td> <td>4 V – 20 V</td> </tr> <tr> <td><strong>Current Range</strong></td> <td>0 – 3.3 A</td> </tr> <tr> <td><strong>Accuracy</strong></td> <td>±1%</td> </tr> <tr> <td><strong>Resolution</strong></td> <td>0.01 V / 0.01 A</td> </tr> <tr> <td><strong>Display Type</strong></td> <td>Digital Only</td> </tr> <tr> <td><strong>Material</strong></td> <td>ABS (Acrylonitrile Butadiene Styrene)</td> </tr> <tr> <td><strong>Length</strong></td> <td>Approx. 7.22 cm / 2.84 in</td> </tr> <tr> <td><strong>Battery Required</strong></td> <td>No (USB-powered)</td> </tr> <tr> <td><strong>Certification</strong></td> <td>CE</td> </tr> <tr> <td><strong>Country of Origin</strong></td> <td>Made in Mainland China</td> </tr> </tbody> </table> <h3>What's in the Box</h3> <ul> <li>1 × USB Voltage &amp; Current Meter / Power Tester</li> </ul> <h3>Who Is This For?</h3> <p>This USB power tester is perfect for <strong>electronics technicians</strong>, <strong>DIY hobbyists</strong>, <strong>repair specialists</strong>, and everyday users who want to verify that chargers and cables are delivering the correct output. Use it at home, in the workshop, or on the go to quickly check any USB power source.</p> <h3>Related Products You May Like</h3> <ul> <li><a href="/products/ancient-nutrition-multi-collagen-advanced-muscle-60-capsules">Ancient Nutrition Multi Collagen Advanced Muscle 60 Capsules</a></li> <li><a href="/products/bu-29mm-sinking-minnow-jerkbait-fishing-lure-bass-trout-pike">B&amp;U 29mm Sinking Minnow Jerkbait Lure – Bass Trout Pike</a></li> </ul> <p>Learn more: <a href="https://www.osha.gov/personal-protective-equipment" target="_blank" rel="noopener">OSHA on personal protective equipment</a></p> <h3>Frequently Asked Questions</h3> <h4>Q: What devices can I test with this USB power tester?</h4> <p>A: This USB voltage and current meter is compatible with a wide range of USB power sources including wall chargers, car adapters, portable power banks, and USB hubs. As long as the output voltage is within the 4–20 V range and current within 0–3.3 A, you can use this tester to monitor performance.</p> <h4>Q: Does the USB power tester need batteries to operate?</h4> <p>A: No batteries are required. The meter draws its operati