As has been said, it depends on what you are trying to find out. If you are indeed looking for data on ES, SD, etc, then an expensive unit is the way to go. In someshooting disciplines, this type ofinfo is more important than actual velocity.
Last Sunday, quite a few of us were at Tomball, just doing our usual thing. NickMarino came over from Beaumont, he was trying several different powders in his 30, so we set my Ohler 35P up, (the printer has not worked in some time), and were able to compare heads up what our loads were actually doing.
Gary Walters had worked up a decent load for his 30BR, and was surprised to see it scooting along at 3050 fps. I brought along some Norma 200 to try with BIB 118'S, It shot real well at about 3010fps average. Vic and Nick both worked up loads with the Chrono, a few other shooters came over and put some rounds through it as well. One shooter suspected his 30BR was a little hot, 3150 fps over the Ohler proved it.
That is how we use a Chronograph. We are able to make direct comparisons on a particular day. You can make a change, and see direct reults.We all know that most 30BR's, 30GR's, and 30PPC's like 112-118 bullets at about 2950 to 3000 fps. With the Chrono, you can just load it untill it hits that, and then tune on either side of that window to tighten it up.
I even leave my 35P in the range house, any friends who wish to use it can. Aside from putting a bullet through one of the screens, I can't see much way you can hurt it.
As you can see, we are not looking for a lot of technical data. If I switch bullets, or powder, it is handy to see just what is going on. With most chamberings, you pretty well know what velocity capability is usuable, the Chrono simply helps you confirm velocities so you are confident that you are in a safe zone..........jackie