Beha Amprobe LM-100
It's never a good idea to guess with measurements, that's what measuring tools are for. No need to look for a power outlet, since it runs on batteries. Just get at it!
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From Amazon
LM-100 Digital Lux Meter with manual ranging and datahold
£169.20
Conrad Electronic
Beha Amprobe 3052348 LM-100 Lux meter 0 - 200000 lx
£166.78
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