WOW.
Well guys I got mangled (on a bloody v-pub) with a few mates the other night, and the following day one of them said "Did you get that chrono you were talking about?". I said "What chrono?". We all laughed.
Next day, that HT Chrono dropped onto my doormat from Amazon. Absolutely no memory of buying it.
Anyhoo, clearly fate. It's a fantastic little unit! I chrono'd the guns, and it reported pretty much bang on the same as the professional chrono at the club. It will record up to 20 shots in a burst and give you the FPS for each shot, and the average over all the whole burst. You can set the weight of the BBs and the calibre, and the unit gives to the estimated range and shot energy. Chargable through a mini-USB and as light as a feather. Zero instructions with it, so press press shit randomly and you'll figure out how it works. Wifi too, but no idea what that's for. Thoroughly recommend. Even when smashed up, I managed to locate what seems to be the cheapest chrono on the web. I'm well pleased. Must get battered more often... oh hang on, not possible.
Anyway, totally recommend it. Hope it doesn't fail after a week but we'll see.
Also - the ASG L96 chrono'd at 410 FPS straight out of the box on 0.20g BBs, coming down to 315FPS with 0.30g BBs which is the weight recommended in the manual.
Thanks for all the other replies and advice guys, appreciated.
Jock
Excellent advice thanks. I'll go shooting with it this weekend, then it's coming apart on the kitchen table on Sunday.