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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?   Can I measure through glass using the PREXISO? We do not recommend measuring through glass as it can lead to discrepancies, which may be large or small – depending on its quality, cleanliness, inclination. . . of the glass.

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