Portable LCD USB Power Charger Voltage Current Waltt Detector Tester Monitor
Matek USB LCD Display Voltmeter Ampere Meter Power Capacity Tester
USB Power Charger Voltage Current Waltt w/LCD Display Tester Detector


Features:
USB Power Monitor
The UPM can be used to measure the output performance of any USB charging adapters,PC USB ,Car USB chargers & Power banks etc.It can also be used to diagnose faulty USB ports, evaluate the quality of USB cables & the capacity of portable power source.
Low power MCU with 10bit ADC
25*15mm segment LCD shows LCD shows clear and accrate numerical readings
6 mades allows the user to measure real-time Voltage,Current,Waltt,Capacity,Total capacity & Time
Very low current sensing resistor (10m ohm)for less voltage drop 
Over-voltage protection & alarm(Max 5.7V)
Over-load protection (Max.3A)
Self-closedown function to avoid the devices is over charged

Specifications:
Working voltage range:4.5~5.7V DC
Working current range:0~3A
Voltage precision:+/-0.5%,Resolution:0.01V
Current precision:+/-1%,Resolution:0.01A
Current sensing resistor:10mohm
Standby current: 20mA

How to Use
1.Connect the UPM into the host machine(Home USB charging adapter,Car USB charger, PC USB port,portable power bank,etc.
 If the input voltage is out of the range of 4.5~5.7V DC ,the UPM will alarm ""BeBe"" & voltage value will blink
2.When the UPM is ready for use it will turn on blue LED,beep & display the USB voltage (V)
3.Connect a target device to the UPM.The UPM will beep once again,then the lnitial mode voltage(V) will be raplaced with current(A)
4.The 6 modes of the UPM can be changed by pressing the button to cycle as follows
 Voltage(V) - Input voltage value is display in real time 
 Current(A) - Current value is displayed in real time 
 Power(W) - Input power is displayed in real time 
 Capacity(mAh) - Output capacity add up to value in real time (Count from UPM & device connection through disconnection)
 Total capacity(Total mAh) - Count from UPM & USB adapter connection through disconnection
 Time(0:00:00) - Charging time escapaced in real time (Count from UPM & device connection through disconnection)
5.The current will be cutted automatically when the device is full charged or unpluged
 UPM alarms ''Be..Be..Be..'',blue LED goes out ,and ''End''is displayed
 Press the button to clear ''End'' & switvh on current 
6.Notes
 Capacity (mAh) will be charged after the device is un plugged 
 Total mAh will be cleared after the UPM is unplugged from USB power source
 Blue LED ON/OFF - Output ON/OFf
 Protection -  Over 5.7V or over 3A, No output
Setting 
Self-closedown function & End Level setting 
UPM detect the full charging according to End Level(EL).Pls set the EL according to different devices
If the current is cutted automatically & device is not full charged,Pls adjust the EL value bjgger
 Hold the button 3 seconds to enter the setting.Quick press the button to cycle through the value (10.20.30.40.60.off).Default value is 30
 Save & exit with beep if no action within 5 seconds 
 OFF - Close the function

Package includes:
1 x USB Power Monitor