From my 40 plus years in the laser and instrument business, there are a few things you can check for yourself before sending the laser off for repair. Power is the first! If your construction laser is using standard alkaline batteries, try some new ones. (Sometimes even new batteries can be faulty, so check a couple sets). If you are using rechargeable batteries, try some standard ones (if the laser has that feature) or plug into the the main adapter/charger in the wall to
