This is an excellent unit and I am very pleased with it. There are two, minor, issues I had with the units I purchased. 1) Using it on an XL650 reloading 380 acp the die could have been a little shorter, approx. 1mm would do. Screwing the die down until contact was made left the actuator at a critical point in not engaging the switch. I shaved the die and all is well. 2) The ability to have more than one die body to allow moving the other parts between different toolheads. It is a little awkward trying to unscrew and screw in the die every time I want to change calibers.
All times that I have used the powder check, it alarmed whenever there was a minor variance in the powder, 1/10th of a grain in smaller calibers.

This powder checker is great. Every time it alerts the powder amount in the case is incorrect. I have not had a false alert using this checker.

These are great. I have three of them now. It's real nice no hearing the alarm when you skip a case!

Easy to set up, works great. I was waiting on the seating/camp die so I could open up one of my stations on my 650!

This powder check is amazingly effective. We run an ammo manufacturing shop running 2000 rounds per day. Thank you Double Alpha for this great product.

Best powder checker that I’ve ever used. Highly recommend.