The laser cost 19.95 at home depot// it (the one in the picture) only showes a 6-10" line so you swevel it along the log--- it works in all but direct sunlite- in my setup its in the 8-10 am time when the sun is directly on the log.
almost every time I cut a slab and dont bother using it I wish i did///.
I bought another straight line unit that shows a line all along the log but it is to week in normal lite .
I like it and reccomand it . JP