On Saturday, April 3, 2021 at 12:38:49 PM UTC+1, alan_m wrote:
On 02/04/2021 12:35, fred wrote:
no massive working distance required. 5-10m ?

I've just checked my Bosch Quigo self levelling green laser device outdoors

With a white card as the "detector" I could just about see the line at
around 6 to 7 metres. Without the white card I could just about see the
line at 4 to 5 metres on my hand. This was at mid-day - bright overcast sky.

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Thank you Alan. Informative and useful