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KWS - V20 USB Voltage Tester
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KWS - V20 USB Voltage Tester

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Current Battery Capacity Detector
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    COD This product supports COD on delivery. Suggestions: Do not place orders with non-COD products, otherwise you will not be able to choose COD payment method.
    Ship between: May 31 - Jun 02, Estimated Shipping Time: business days Order Processing Time may require a few days. Once dispatched from warehouse, Shipping (or Delivery) Time depends on the Shipping Method.
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Main Features:
Multifunctional Testing Tool, it can measure voltage, current, discharge flow, also includes timing, over flow and voltage protection
Small size,easy to carry and store, you can use it anywhere and anytime
The screen displays current and voltage data for easy viewing
With automatically save data function when interruption of power supply

Measuring Method:
USB input port is plugged in 5V charger, USB output port is connected to mobile phone, directly read the current and voltage parameters
Measuring Micro USB line quality: USB output port is connected to mobile phone, USB input port is plugged in the 5V charger first, remember the voltage, then Micro USB input port is connected to 5V charger, remember the voltage. The smaller the voltage difference, the better the quality of the Micro USB line
Use TP4056 and other linear charging circuit, through this capacity table, to fully charge the battery with completely no power, the capacity data is the battery capacity, and using this method, you can also test the mobile phone charging capacity
Connect this testing tool to portable power source and turn on it. Press the button until the capacity data is zero. Insert the cell phone to charge until the portable power source switches off automatically. The next time you open this testing tool, the display capacity is the portable power source output mAh

Voltage ( input / output ) : 3V - 9V
Voltage resolution: 0.01V
Current ( input / output ) : 0A - 3A
Current resolution: 0.01A
Accuracy: + / - 1 percent



Application: Computer,Mobile phone

Dimensions and Weight

Product weight: 0.0190 kg
Package weight: 0.0410 kg
Product Size(L x W x H): 7.30 x 2.40 x 1.30 cm / 2.87 x 0.94 x 0.51 inches
Package Size(L x W x H): 12.00 x 8.00 x 1.50 cm / 4.72 x 3.15 x 0.59 inches

Package Contents

Package Contents: 1 x USB Detector

KWS - V20 USB Digital Voltage Current Tester Battery Capacity Detector- Cloudy

KWS - V20 USB Digital Voltage Current Tester Battery Capacity Detector- Cloudy

KWS - V20 USB Digital Voltage Current Tester Battery Capacity Detector- Cloudy

KWS - V20 USB Digital Voltage Current Tester Battery Capacity Detector- Cloudy

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Customer Reviews

4.85 out of 5
  • 41
  • 7
  • 0
  • 0
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See all 48 reviews Write a Review
  • D
    Yes (0) Color: Cloudy
    Nützlich um den Akkuzustand seiner Geräte zu überprüfen.
    Das Gerät ist sehr einfach zu handhaben. Einfach ins Ladegerät/Powerbank einstecken und an den Ausgang das zu ladende Gerät anschließen. Schon werden alle Daten automatisch erfasst.
    Auf den Bildern habe ich eine Nitecore Tip mit 500mAh Akku geladen.
    Der Akku was fast leer.
    Absolut nichts. Sehr interessantes und nützliches Tool.

    Jul 13,2018

  • José
    Yes (0) Color: Cloudy
    Comprobador de cargadores USB, Power banks, etc.
    En su pantalla indica el voltaje de salida de la fuente de energía usb a la que está conectado, y la corriente (Amperios) que está pasando al dispositivo que se está cargando,
    También es muy útil para comprobar la calidad de los cables de carga.

    Jun 06,2018

  • Gabe
    Yes (0) Color: Cloudy
    everything is alright. the technical parameters of the product have changed compared to the description, this is the more advanced model:
    Model name: Keweisi KWS-V20
    Voltage: 4-20V +-1%
    Current: 0-3A +-1%
    Time: 0-99 hour
    Capacity: 0-99999mAh

    Jun 26,2018

  • servan
    Yes (0) Color: Cloudy
    Just good
    Good relation price - quality
    Good relation price - quality
    Good relation price - quality
    Good relation price - quality
    Good relation price - quality
    Good relation price - quality
    Good relation price - quality
    Good relation price - quality
    Good relation price - quality

    Sep 12,2018

  • José
    Yes (0) Color: Cloudy
    Muy útil
    Artículo muy util para comprobar voltaje y amperaje de cargadores usb, power banks, etc.
    También es útil para comprobar la calidad de los cables de carga.
    Buen precio

    May 22,2018

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There are two key factors which will affect the time you receive your items.

Item processing time
After receiving your order,we require some time to test the product to ensure its quality.The exact processing time varies depending on the item.The average processing time is 3 working days.but this can also be affected by the item's stock status. For small quantity orders,the processing time is 1-3days while larger quantity orders may require 2-5days.
Shipping methods
China Warehouse:
Shipping Type Country or Region Arrive within 1-7 Days Arrive within 8-15 Days Arrive within 16-30 Days Arrive within 31-45 Days Average Time (Days)
Unregistered Air Mail or Registered Air Mail United States 0.52% 44.87% 49.88% 3.5% 18.13
Spain, United Kingdom, Italy, Germany, France & Portugal 5.18% 43.44% 48.34% 1.17% 15
Netherlands, Greece, Poland, Hungary, Slovakia, Czech Republic 2.96% 40.34% 52.54% 3.74% 18.66
Russia 0% 4.45% 84.41% 11.1% 28
Japan, Korea 0% 21.30% 68.80% 9.66% 17.75
Brazil 0% 0% 23.91% 72.09% 38.6
Turkey 0% 37.75% 59.05% 3.1% 20.33
Thailand, Singapore & Malaysia 0% 40.39% 56.12% 2.6% 16.2
Other countries 0.7% 38.79% 47.94% 8.56% 23.57
Priority Line United States 12.28% 79.05% 7.4% 0.52% 11.75
Spain, United Kingdom, Italy, Germany, France & Portugal 8.44% 66.56% 23.45% 0.45% 13.55
Russia 0% 3.48% 75.79% 20.04% 31
Brazil 2.21% 6% 61.29% 25.46% 30
Turkey 20.42% 77% 3% 0.08% 10
Australia 7.67% 86.60% 5.68% 0% 11
Korea 97.54% 1.57% 0.89% 0% 7
Japan 95.80% 2.09% 0% 0% 6.84
Thailand, Singapore & Malaysia 58.96% 41.04% 0% 0% 8.45
Other countries 22.33% 30.8% 27.62% 17.64% 18.65
Expedited Shipping ALL countries(EMS) 3.8% 46.8% 26% 15% 14.8
ALL countries(DHL) 65.8% 25.75% 3.86% 0.37% 6.72
GW Warehouse: Typically 3-5 days to the UK, 3-7 days to other European countries.
USA Warehouse: Generally, 3-7 days to a USA address.
ES Warehouse: Generally, 2-5 days to the Spain, 3-7 days to the Portugal.
Shipping from warehouse nearest to shipping address is faster. Additional charges may apply.
Note: This is a general guide and delays maybe caused force majeure, natural disasters, inclement weather, war, public holidays, and factors outside our control. Generally speaking, we offer free shipping for KWS - V20 USB Voltage Tester to United States (US, USA), United Kingdom (UK, GB), Germany, Italy, France, Spain, Portugal, Poland, Brazil, Russia, Japan, Greece, Austria, Hungary, Slovakia, Czech Republic, Ireland, Lithuania, Israel, Denmark, Norway, Sweden, Canada, Australia, Netherlands, Korea, Turkey, Mexico, Ukraine, Romania, Columbia, Thailand, Singapore, Malaysia etc. Please choose the shipping methods for the final price.

Payment accepts PayPal,Credit Cards,Wire Transfer,Westem Union, YandexMoney,Webmoney,Boleto,OXXO and BKM as secure payment methods.

The most convenient payment method in the world.
Wire transfer
For orders which exceed $1,500,please contact us at
Note: please email us the order number,the amount transferred along with currency type,and the exact date of the wire transfer.
Western Union
Please contact us at for details.
Note: please email us the following information after you have paid via Westem Union:
· Control Number(10 digits)
· The exact amount sent along with the currency
· Name of sender.
· Address of sender
YandexMoney、 Webmoney
With YandexMoney and Webmoney, it is convenient and safe for you to pay via credit card、wallet or cash
For Brazil customers, we accept Boleto: you only need to fill in the payment information, remember your Boleto Voucher information and pay it within 3 days at any Boleto stores.
For Mexico customers, we accept OXXO: you can choose OXXO payment on our website, and then remember your OXXO Voucher information and pay it within 3 days at any OXXO stores.

Do you want to bulk buy ? Please submit your wholesale inquiry below. Please note we usually don’t offer free shipping on wholesale orders, but the wholesale price will be a big bargain.

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