--- product_id: 19087347 title: "5A/9V LED Display Multi Tester Dual USB Output Current Detector for Phone Charger, Power Bank" brand: "visit the keveisi store" price: "0 zł" currency: PLN in_stock: true reviews_count: 8 url: https://www.desertcart.pl/products/19087347-5a-9v-led-display-multi-tester-dual-usb-output-current store_origin: PL region: Poland --- # 5A/9V LED Display Multi Tester Dual USB Output Current Detector for Phone Charger, Power Bank **Brand:** visit the keveisi store **Price:** 0 zł **Availability:** ✅ In Stock ## Quick Answers - **What is this?** 5A/9V LED Display Multi Tester Dual USB Output Current Detector for Phone Charger, Power Bank by visit the keveisi store - **How much does it cost?** 0 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/19087347-5a-9v-led-display-multi-tester-dual-usb-output-current) ## Best For - visit the keveisi store enthusiasts ## Why This Product - Trusted visit the keveisi store brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Full description not available ## Features - Easy to Use: simply plug in and you will get data - Easy to Read: voltage and current displayed in different color - Easy to Carry: small, compact, only thumb length long - ›See more product details ## Images ![5A/9V LED Display Multi Tester Dual USB Output Current Detector for Phone Charger, Power Bank - Image 1](https://images-na.ssl-images-amazon.com/images/I/61xL92mrpWL.jpg) ![5A/9V LED Display Multi Tester Dual USB Output Current Detector for Phone Charger, Power Bank - Image 2](https://images-na.ssl-images-amazon.com/images/I/51%2BKlh33k2L.jpg) ![5A/9V LED Display Multi Tester Dual USB Output Current Detector for Phone Charger, Power Bank - Image 3](https://images-na.ssl-images-amazon.com/images/I/51iJmW%2BQ67L.jpg) ![5A/9V LED Display Multi Tester Dual USB Output Current Detector for Phone Charger, Power Bank - Image 4](https://images-na.ssl-images-amazon.com/images/I/51cUTcoh8HL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐ It's cheap and it works, but current accuracy is poor *by N***R on Reviewed in the United States on December 13, 2015* I already own several USB power monitors, including the  DROK Dual-USB Detector . This product ( LED Display Multi Tester Dual USB Output Current Detector ) seems to offer the same functions at half the price, so I decided to give it a try.The product was shipped from China and took 3 weeks to arrive. Not a big deal in my case. It came with zero documentation, only a label on the plastic bag that says:KEWEISIModel: KWS-10VAVoltage: 3-9V +/- 1%Current: 0-3A +/- 1%[Accuracy]I compared the accuracy of this USB meter against a professional digital multimeter (Agilent 34401A). The voltage reading is close enough, showing 5.07V instead of 5.035V. But accuracy of current reading is very poor, especially at the lower end. For example, at 0.5 Amp current, the reading of this USB meter shows 0.45 - 0.46A, or 8-10% too low. At higher current such as 1A, the USB meter shows 0.97A, which is just 3% lower.In contrast, the current reading of my DROK USB meter is consistently accurate to the last digit (0.01A), or just 1% error at 1 Amp.[Other Observations]- The two USB ports can be used for both Power and Data, which is good.- The meter itself consumes 13mA with no load connected- Depending on the orientation of the USB port, the LED display could be facing the wrong way. The DROK meter is better in this aspect, since it comes with a short USB cable connector.[Bottom Line]The KEWEISI USB meter is not as accurate as the DROK counterpart. But for most applications, all you need to know is whether your USB port is charging at slow (0.5A), fast (over 1A), or not at all. A precise reading is not really necessary in this case. Therefore I consider this product a good value just for its lower cost. ### ⭐⭐⭐⭐ Works as it says !! Great little usb tester *by L***6 on Reviewed in the United States on March 23, 2019* Well this is a really nice amp meter for testing charging speeds from phone adapters and computer usb ports . It's a handy tool for testing cables because not all cables are fast chargeThis adapter dose support fast quick charge 3.0The only issue I found was as u see in the 3rd pic is that the USB was not properly align in the cut out hole on the tester but for 5 $ that not something to realy complain aboutSo I give it 4 out of 5 stars because if the port not being aliened but u get wait u pay for so I'm really happy with it recommend it.. ### ⭐⭐⭐⭐⭐ So Useful! *by A***R on Reviewed in the United States on June 1, 2018* I have struggled sometimes with charging. Sometimes I plug in my phone and get barely a trickle. Sometimes I get nothing. I can painstakingly test each piece by waiting ten minutes and switching out individual pieces or I can throw away everything and start over. Generally I go for tedium, because I am cheap. Since getting this product I have discovered two faulty USB ports on a power strip, two useless USB to miniUSB charging cables and 1 phone charging cable that wasn't worth having. I absolutely love knowing that my phone will be charged when I plug it in. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/19087347-5a-9v-led-display-multi-tester-dual-usb-output-current](https://www.desertcart.pl/products/19087347-5a-9v-led-display-multi-tester-dual-usb-output-current) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-19*