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	It is a sunny day and although the distance I have measured is short my PREXISO always displays 255. What does that mean? Can I measure through glass using the PREXISO? Could the laser beam damage my eyes or my health? When I try to use the PREXISO to measure the distance to some shiny metal cladding the display shows 256. What does that mean? Can the PREXISO operate using rechargeable batteries? Can I use the PREXISO to measure my arched doorways? I cannot see the red laser dot, but the instrument still shows a distance in the display – what does that mean? I would like to use the PREXISO to hang several pictures at the same height. What is the best way of doing this?   I cannot see the red laser dot, but the instrument still shows a distance in the display – what does that mean? The instrument sees the laser beam better than we can with the human eye, which means it can measure even when we can no longer see the red laser dot. However, you should always take several check measurements to confirm that the instrument has measured to the place you intended. If you need to see the laser dot better you can wear special laser spectacles or simply hold a red-tinted film in front of your eyes.

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