Trigger Pull Gauge

I use a Wheeler standard spring gauge. If you're finicky about accuracy maybe a digital version would serve better but the standard gauge seems to give me a consistent reference.

Lyman digital

Lyman here too

I also use the Lyman. Great for the money.

I use Wheeler Trigger Pull Gauge. Maybe not great but that is. 

Lyman digital

There is a video on Youtube with the Lyman and Wheeler digital gauges compared head to head. Might show some differences buyers would be interested in. The mechanical gauge that I currently have is all I need and I'll never have a dead battery or break a sensor. But the digital gauges are nice.

I've had my Lyman about 15 years. Haven't changed the 9 volt battery yet.