My trigger pull gauge is simple and reliable. I take a piece of string and tie it around the trigger. I tie the other end to a 2.5 hand weight. I lift it carefully with the trigger of the cocked firearm. If it does not fire (and usually it does not fire), I add a little 1 lb. weight and try again. If that doesn't work I add another 1 lb. weight. Usually that will fire a SA trigger. For DA triggers, I tie on two 5 lb. hand weights. I adjust up or down to figure out the DA weight of pull. It does not give an Olympic level result, but it's about as close as the spring type scales I've seen commonly for sale. JMHO. Sincerely. brucev.

__________________
<><