Socket & See PDL PRO Instruction Manual & Specification page 4

2.2 Indication
The white display backlight will illuminate when switching on and during
testing. To preserve battery life the backlight will switch off after
approximately 4 seconds of inactivity. The unit will automatically power
off after approximately 3 minutes of inactivity. To switch the tester back
on after auto power off, press any button..
Battery Status
Mains
3. Usage
Volts Present/Polarity LED
Voltage LN/LE/NE
toggle button
Hands Free selection
button
*LCD display shown in the no trip loop function.
4
Mains Voltage
Indicator
4mm colour coded
sockets
PFC-PSC/Voltage toggle
button
Rotary selection dial
Polarity touch pad