This is my first laser level and I am very happy with my purchase. I got this because I was installing kitchen cabinets and didn't want to bother with finding a high spot on my (very) uneven floors to navigate. It took quite a bit of learning to figure it out, but after reading the manual online it all became clear to me. Long story short, the lock/unlock switch on the side doubles as a power switch in all respects, and if the laser flickers it's out of range and you'll need to adjust the device to make it smoother. The device comes with a detachable magnet in case you don't have a tripod handy. This was very helpful for me as I didn't have a tripod mount back then. I just attached a bubble level to my fridge and moved it until it was where I needed it. When the tabletops were finally installed, they were leveled to within a sixteenth of an inch at over 12 feet high. For my first installation I'll take it!
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