Sekonic L-308X
One centimetre here and there is really not inconsequential, use an electric measuring tool to be safe. No need to look for a power outlet, since it runs on batteries. Just get at it!
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From OnBuy
Sekonic L-308X-U Flashmate Light Meter
£182.95
Available pre-owned from £214.99
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This product is also available at 3 unverified stores.