I own a Tif, and a TPI. I like the TPI a lot better.
http://www.afcintl.com/720.htm

Check on Ebay, where I got mine. Mine didn't work when it arrived. I
called their customer service, and the fellow talked me through fixing
it. He let me send it back, and he replaced a bad on off switch,
donated a carry case, and mailed it back to me, no cost to me.

The customer care at TPI was excellent for me.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
..

"Smarty" wrote in message
...
I have just installed a lot of gas piping (for a natural gas fired
emergency
electrical generator) with many joints in the piping. I have looked
online
at different combustible gas detectors (at places like hvactool.com)
and
have found units ranging from $59 all the way up to several thousand
dollars. Does anyone have a recommendation for a sensitive, reliable,
and
relatively low cost instrument which can detect / localize gas leaks?

Thanks very much for your advice.

Smarty