0.91 inch 128 x 32 Dot Matrix 4 Bit OLED USB Voltmeter Current Power Capacity Tester

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Converter:cminch

Converter:inchcm

Main Features:
Overvoltage, undervoltage remind
Screen flip up / down storage
USB signal lines through without affecting communication
The screen turns off
Group 9-capacity storage
Unit switching capacity
Automatic calibration current zero
Display color: Blue / White
Brand: Jtron
Product weight: 0.013 kg
Package weight: 0.093 kg
Product size (L x W x H): 5.7 x 2 x 1 cm / 2.24 x 0.79 x 0.39 inches
Package size (L x W x H): 12 x 6 x 3 cm / 4.72 x 2.36 x 1.18 inches
Package Contents: 1 x USB Tester

It forbid for being used for inductive load,  eg: The load with motor and fan. 
It can be used for digital products,  eg: mobile phone,  power bank,  USB flash drive,  etc.

When contact the power supply, the screen shows welcome window firstly and then comes into main interface. The first line displays voltage, power and data set. The second line displays current and accumulated capacity.

Current zero calibration function:
Because of the influence of component aging and temperature variation after long-term use, the error may become bigger when it measures small current. So you can keep pressing the button on the back to connect power supply in the no-load terms, until the LED lights. The calibration is accomplished.

In the main interface, you can click the button to switch data set one by one. And it provides for storing and checking 0 to 9 totally ten group data set.


Capacity stored function:
When data set is between the 1 to 9 group, the current capacity will be stored after power off. And the stored capacity will be accumulated after power on. When the data set is 0 group, the current capacity will be stored after power off. When power on next time, the stored MAH is blinking displayed .When the new MAH is up to 1 MAH, the stored MAH will be covered, and the values will start over.

Screen rotation function:
In the main interface, keep pressing the button, until the LED lights and then goes out (time about 4s), loose the button, the screen is rotated and automatically stored for being used next time conveniently.


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