Features: 

1.Three characteristics: 
The phone is fully charged to automatically turn off the output. No load 20seconds automatically shut down output.It displays the voltage and current data mAH, timing, easy viewing.It can detect mobile power output mAH. 

2.Power-down save function:
USB and MicroUSB port male double take power, can be detected MicroUSB linequality.Current sampling 50 milliohms, smaller loss.With precision current calibration, higher current accuracy. 

3.Measuring voltage and current: 
USB male plug 5V chargers, mobile phones and other equipment female insert, readcurrent and voltage directlyMicroUSB line quality measurement: female plug mobile phones and other devices,first use the native male plug 5V chargers, remember that voltage, then MicroUSBcable into the bore in mind that the machine MicroUSB charger voltage from 5V,the smaller the gap voltage MicroUSB cable quality is better 

4.Battery capacity test: 
Use TP4056 and other linear charging circuit through this capacity to the tablecompletely empty battery is fully charged to full capacity reading on thebattery capacity, the use of this method can be measured charge capacity of thephone, the phone can even calculate the charging efficiency. 

5.Mobile measuring power output capacity and efficiency: 
The first machine connected mobile power, mobile power turn on, long press thebutton until the volume of data to zero, into the phone and more mobile powercharging until no power automatically shut down. Next displayed when you turnthe unit capacity is the mobile power output mAH. Note that this mAH thannominal mAH small output mAH * Output voltage 5V / battery mAH * Battery voltage3.7V = mobile power efficiency