DAA Magnetic Powder Check
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.