3/4 Digit USB Charger Doctor Digital Charging Battery Voltmeter Ammeter Ampermeter Current Meter USB Detector Smart Function


Sale price $4.99 Regular price $7.49

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3/4 Digit USB Charger Doctor Digital Charging Battery Voltmeter Ammeter Ampermeter Current Meter USB Detector Smart Function
3 Digit/ 4 Digit USB Tester
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3 Digit USB Detector(Red Blue/Red Red)
Can easily measure the operating current of the output voltage of the USB port and equipment 2. smallsize , no power , and other ancillary equipment, plug and play also detect USB charger output voltage and current are standard suitable for factories, Laboratory and users.
Technical indicators:
Scope of work: Current (0~2.5A) can detect mobile phone charger voltage compliance DC5V
Operating Range : U = 3 ~ 7.5V I = 0 ~ 2.5A
Resolution : Voltage 10mV current 1mA
Error : voltage <± 1% current <± 2%
Full scale drop : ( When measuring current ) 200mV
The tester uses a new generation of power four semi~ double loop integral converter IC , with a precision bandgap reference , range accuracy , high precision , stable and reliable performance , strong anti~interference ability , high temperature can be used for measuring USB powered or power consumption of the interface , mobile phone charger , U disk and other products.
1, USB powered devices can be used to measure air , voltage loads , USB terminal equipment working voltage and current
2, The current and voltage cycle , easy to use and practical.
3, Compact and easy to carry , no additional power supply
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0.91inch USB Meter(Blue/White)
Voltage measurement range: DC3.7-22.0V
Current measurement range: DC0.00-3.00A
Power measurement range: 0-65W
Capacity measurement range: 0-99999mAH
Energy measurement range: 0-99999Mwh-999WH
Voltage measurement accuracy: +/- (0.2% ---1 words)
Current measurement accuracy: +/- (0.8% ---3 words)
Refresh rate: 2 times / sec
Static power consumption: 10mA
Font color: blue / white
Product weight: 14 grams (including packaging 46 grams)
Product size: 64.0mmx21.6mmx11.2mm
Port mode: compatible with USB2.0 USB3.0
Display screen: 0.91 inch 128x32 dot matrix OLED display
Automatic calibration of current zero function
After long-term use, due to aging of the device or changes in ambient temperature, small current measurement errors may increase. The solution is to hold down the button and the breathing light is on, and an automatic calibration current zero operation is performed.
After entering the main interface, the first line displays the current voltage value, the current power and the current data group, and the second line displays the current current and the cumulative capacity respectively.
Overvoltage and undervoltage reminder function
When the voltage is higher than 5.3V, it will be displayed on the screen and will flash continuously, indicating that the USB voltage is too high. When the voltage is lower than 4.7V, it will be displayed on the screen, and it will flash continuously, indicating that the voltage is too low, the flashing cannot be turned off, when the voltage is normal. The range disappears automatically.
Capacity automatic storage function
In the main interface, if you click the back button, you can cycle through the next set of data, the tester can provide 0-9 a total of 10 sets of data to save and view.
When the data group is 1-9 groups, the current capacity is stored when the power is turned off, and continues to be accumulated when the power is turned on next time. When the data group is 0 group, the current capacity is stored when the power is turned off, and the next time the power is turned on to remind the last capacity, but When the accumulated capacity exceeds 1MAH, the last data is automatically cleared and re-accumulation begins.
In the main interface, double-click the back button (within 0.5 seconds between two presses) to enter the data viewing interface. The secondary interface displays the cumulative capacity of the current data group. In this interface, click the back button to view in turn. The next set of data.
In the data viewing interface, if you press and hold the back button for more than 2 seconds, you can clear the data in this group. If you double-click the button, you will exit to the main interface.
Capacity unit switching function
In the main interface, press and hold the back button for 2 seconds, release the breather light when it is lit, and switch between mah and mwh.
Screen flip function
In the main interface, press and hold the back button for 4 seconds, the breathing light will be on when it is turned on and off, and the screen can be flipped and automatically memorized for later use.
Screen off function

In the main interface, long press the back button for more than 6 seconds to release, you can turn off the screen display and enter the power saving mode. At this time, the breathing light flashes, click the button to return to the main interface

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USB Tester with USB Cable(Red Blue/Red Red)
The compact USB dual table can show voltage and current and charge two phones simultaneously
Suitable for the vast majority of mobile phones, mobile power, tablet PCs and other USB devices
Output 1: data communication function and charging voltage output
Output 2: Apple tablet, Apple phone original or non-original mobile charger, through OUTPUT 2, it can high-current charging, but cannot data communications


Supply voltage, test voltage: 3.2~10V
Test current: 0~3A, up to 10A Current
Operating current :< 20Ma
Display: 0.28” LED
Product dimensions: 69x26x19mm
USB extension cable: >120mm
Measuring rate: >500Ms/times
Accuracy: 1%
Low supply voltage: +3.2V
Maximum supply voltage: +10V
Working temperature:-10~+65
Operating humidity: 10~80% (non-condensing)
Working pressure: 80~106kPa
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USB Tester

It can measure current and voltage of the power supply equipment with USB port.
Plug and play, no extra power supply needed.
The voltage and current will be displayed circularly.
Small sized, easy and convenient to carry.


Workable range: 3.5 - 7.0V, 0 - 3A.
Resolution: voltage 10mV, current 10mA .
Error range: voltage <±1%, current <±2%.
Full-scale voltage drop:200mV.
Workable temperature: 0 - 60 Degrees Celsius
Color:Transparent, Blue

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USB Charger Doctor

It can measure the USB-powered devices empty and . Easy to use and practical.
Compact and easy to carry, no additional power supply, plug and play.
It can easily measure the output voltage of the USB port and the device operating current or load voltage
Detect any USB charger such as PC USB, home charger, car charger.
Wide range of applications, any phone, any electronic product, Easy to use. suitable for factories,
laboratories and personal use.


Detection range: Voltage: 3v-7v error 0.1v
Current :0-2.5A error 0.01A
Case Color:Blue

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