Existing kitchen counter bases were off over 1/2 inch. Kraftmaid granite installers required level to be within 1/8 inch. We had not expected this. I googled and got a quick lesson on how to approach this problem. A 360 degree spinning laser beam helped show level around the entire kitchen. The most reasonable price and useable was a Skil with tripod ($100 @ Lowes). Home depot sold an almost identical type unit from another manufacturer that I tried two of and returned. The HD level was the same price but impossible to use. If you need to use one of these handy units, save yourself the time and get the Skil level from Lowe's. Bosch makes one of these levels too, but it is $500 !