I wanted to try a laser pointer on my new-to-me Little Gracie frame which has a Janome 1600 mounted on it. My husband found a laser pointer attachment at Harbour Freight for $5. which I plan to try mounting on the carriage (it has sticky tape or small screws) to trial following a stencil or quilt motif. For that small amount, it's worth a try, and I can always buy more batteries if it works as planned. It's meant for attaching to a circular saw or such.
Forgot to add - I have yet to try this out, time has not let me near my sewing room for awhile!