I bought a Chrony, the red one, about 10 or 15 years ago. I used it for about 3 years, just enough to see the need for it, when it up and charged me one day when I was shooting over it with my 30-30. I didn't know how much damage a charging chrony could do to me but I didn't want to find out so I shot it right in the digital display. I figured that had to be the same as shooting it between the eyes. It flipped over backwards and was deader than a rock.
Next time I went out to test a load, I started to regret shooting my chrony and decided that even if it had charged me, it didn't have a mouth or teeth and probably wouldn't have hurt me much if it had completed it's charge and attacked me.
I went on the Chrony web sight and saw that they would take a trade in on a shot-up chrony for a new one, and it looked like a pretty good deal so I gave them a call. The gal that answered the phone said that if I spent a little more I could get a Master Chrony and then next time I had one charge me, I could shoot the box, to stop the charge, but do no real damage the the thing's brain and all I would have to replace would be the box, which would be much cheaper.
I had her send the Master Chrony to me, a red one again, and it behaved real good for a few years. I really liked the digital readout, right there on the bench with me where I could read it without taking out my field glasses between every shot. One day I was shooting my 10 inch, scoped, Contender, in 22 Hornet when it happened again. That dang ol Chrony just started gettin madder and madder, cause I was shooting a little low over its sensors and here it came, charging right at me. Luckily, I had a round chambered in the Hornet so when it started its charge, I let fly and hit dead center. The bullet penetrated, full length and stopped the chrony, dead in its tracks. I called the lady at Chrony again and she sent me a new box for my master chrony for only about $20 plus shipping. It was a red one too. It gives individual velocities for each shot, High and Low for a string and also gives extreme Spread and Standard Deviation.
I hope this chrony will not get upset and decide to charge me. I am really attached to the thing and don't think I could do load development without it.
Sixgun