I have this one - it works well to get you on paper. Its bright enough in the daytime to 25yds and 50yds at lowlight which I recommend to do your sight. No, it won't do everything but you can fine tune it at the actual range shooting.
I recommend a sturdy rest to keep the rifle stable while checking the scope with the laser.
They are at a low price here:
Another user said the batteries don't last long but I had mine over a year in a half and the batteries are still good but of course your not sighting a rifle everyday...