WayinTop 2pcs 650nm Focusable Focus Adjustable Lens Laser Red Cross Diode Module 3-5V with Driver Plastic Lens (Cross Laser)

Needed a vertical cross to be projected for an equipment alignment rig and made a holder with a precision drilled hole to hold this diode absolutely vertical to ensure accuracy, but resulting cross is several degrees out of true, and turning the bezel to focus the laser moves the centre around. So, if this is to be a part of something useful you'll need to devise a quick and easy method to recalibrate each time the focus is changed - not ideal!

A red cross able to be focused sharp over 2 metre distance. I mounted this in a custom made boss to align a marine prop shaft. Powered by a 5v USB supply rather than a battery, I had it on for continual periods of half an hour, over many hours of engine orientation adjustment, with no issues. Sharp cross on target, just over 2 metres, but imagine it can cast a beam over much longer distances.

they give a clean, well focussed sharp line

Great little lasers, a good focus range.

The focus of the cross hairs is poor