Testo 540
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!
AD
From OnBuy
Best Price Square LIGHT METER 99999 LUX 540 By TESTO
£163.42
Conrad Electronic
testo 05600540 540 Lux meter 0 - 99999 lx
£158.15
Rapid Online
Testo 0560 0540 540 Lux Meter Illumination Measuring Device
£173.89
Advertisement