If you're choosing between lasers, buy this one. My husband is a contractor and he bought a DEWALT DW089K laser with a micro adjustment knob on top and he didn't like it because it didn't have a pendulum lock and the battery cover was difficult to open. The micro adjustment wasn't very helpful so he returned it and bought this one. It was $30 more expensive and worth every penny. He has had several laser levels from different manufacturers and says this is the best he has ever used. It is very bright indoors and can also be seen up close outdoors. It's very easy to use. The good thing about the battery pack is that you can use AA batteries or 12v Dewalt batteries if you have them. The hard case is great too.