The voltage on this measuring tool is 9 volts. No need to look for a power outlet, since it runs on batteries. Just get at it!
LM-120 Digital Lux Meter automatic/manual range selection, datahold
Conrad Electronic
Beha Amprobe LM-120 LM-120 Lux meter 1 - 200000 lx
Rapid Online
Amprobe LM-120 Light Meter Auto Ranging