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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?   It is a sunny day and although the distance I have measured is short my PREXISO always displays 255. What does that mean? The brightness of the sun is preventing the PREXISO from receiving enough signal to provide a reliable reading. In conditions of continuous strong sunlight your only option is to shade the target.

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