When transferring the main body, instructions to attach a stopper to the laser head are in the instruction manual, but it can only be considered an excuse for failure.
The stopper is in the battery box and can not be set unless the battery is removed.
9v Since the connector of the battery is very difficult to detach, I think that such a correspondence is impossible for practical use.
In the first place, portability is a product to be considered, setting stoppers with such a hard-to-use method is only for convenience at the time of product shipping by the manufacturer, and user's convenience is not considered at all.
Laser line is a little thin. It is also a bit hard to see. I do not know how to use in a high position. I would like you to moderate the instruction manual a little more. I think that it is a convenient product for the price.
As accuracy is sweet, but the price is pricey, is there any way? Can amateurs use it to do the work? I wonder if it will be an unusual usage. I used it for vertical and horizontal seeping to carve a surface. For this application, I am planning to use it for seeping three-dimensional objects.