Forum Boss said:
5. PVM-21 -- Once assembled (like a box kite), it is very fast, easy to set up. IR emitters work fantastic -- it will register lead pellets in complete darkness. AC adapter is funky. Unit works better with 12V battery but that has to be carried separately. Very reliable unit if you just use the white receiver box, but then you have to write down the results. Software is cranky to install and Not at all intuitive. Most guys using PVMs have given up on using with a lap-top. Unit desperately needs a better (less buggy and simpler) software interface, and it should be converted to run 5.5 volts so you could power from your laptop.
What would I buy? CED for entry level. Oehler if you have the money. PVM-21 if you shoot in low-light. PVM is excellent, but the computer interface is "not ready for prime time" and far too complex for most users. We had issues just installing the software on laptops -- you have to fiddle around to get the drivers to "take". If PVM would plug directly into USB port (like a printer) with clean software, it would be my choice for field assignments.
I have a PVM-21 and have been using it for about a year now. Your comments are mostly spot on, but here are a few of my own observations:
- I bought a 1800mah Li-ion CCTV battery to power it for $20 (
http://www.dhgate.com/1800mah-lithium-ion-li-ion-rechargeable-battery/p-ff808081283858580128484242130d56.html). Works great, lasts a LONG time. I've had it running up to 4 hours without a problem.
- I installed the software. If you don't have Windows XP, don't bother trying to install it. As mentioned, drivers are an issue for any other version of Windows OS. If you get it to install, the only real useful functionality is the ability to hook up the unit via USB and import all the readings from your session. That part is actually very easy. That way, you don't have to write every reading down.
- The RJ-45 (network cable) interface that connects the screen to the controller is somewhat cranky. The cable does not seat very firmly and after a string of shots (like 10 or so), I might get an "Err 15" or start getting "No Stop" or "No Start" errors. At that point, I have to reseat the cables and things work fine again. It's a bit of a pain, but I have a few ideas in the works for fixing it (MacGuyver fixes, not technical). I have had it go on extended periods of no misses (50 - 60 shots), so when things are setup and working, it does work reliably.
Overall, I think it's a great chronograph, very accurate. I am not sure it is worth the price though as the few issues I noted above make it somewhat of a pain. However, I own it now and there's nothing to be done short of selling it at a loss and getting something else. If I had to do it again, I would go buy the Oehler 35P that is being re-released for $575.