The stanley fat max 77 123 clli cross line laser kit has a 25 metre range for use in an interior or exterior working environment it projects 1 horizontal and 1 vertical line to create a cross line making this ideal for quick layout jobs it has an out of true level sensor magnetically damped pendulum and a pendulum lock for safe transportation specification level accuracy4mm 10m working range 25m power 3 x aa batteries supplied laser class 1thread 14in