My chrono recently suffered a broken battery lead. I decided to try to fix it, but it's about 20 years old and something has been rattling around inside for quite a while now, so I also ordered a new one. I had been using a ProChrono called a Jr, I think the cheapest one they sold back then, and I got another ProChrono called Pal, also the no frills model, They are the same grey plastic box and no doubt the same inside. I replaced the 9 volt snap and found out that the thing rattling around was a little plastic finger that holds the sensor in place, but since they use 8 fingers, it's still good. Then the new one came and I decided to try to line them both up to read the same bullet. After considerable fiddling I got it to work, and I must say, when everything is working right, they are good to within about half a percent. I think that's pretty good for what is basically a budget brand. I say "when" because I had erratic readings all day with both units, and I think I know why.
I stopped using the screens because I didn't think I needed them. Where I shoot it's usually under leaf canopy with some sunlight getting through, and it must be a good background. Today was crystal clear with almost no leaves out yet and that must have caused problems. All reading were either within half percent, some even closer, or way out around 10%. A big tree came down recently and the area is brighter, too. So the experiment got a little botched but I'm pleased with the results I got. Ill try to check it again with the screens. I'm sure going to carry them from now on.
I stopped using the screens because I didn't think I needed them. Where I shoot it's usually under leaf canopy with some sunlight getting through, and it must be a good background. Today was crystal clear with almost no leaves out yet and that must have caused problems. All reading were either within half percent, some even closer, or way out around 10%. A big tree came down recently and the area is brighter, too. So the experiment got a little botched but I'm pleased with the results I got. Ill try to check it again with the screens. I'm sure going to carry them from now on.