Which natural gas leak detectors does everyone use and would you recommend it?
I use the TPi 712 as a diagnostic tool,
http://www.tequipment.net/TPI712.asp
Or if you mean installed detectors in the home, I like Kidde detectors,
http://www.kiddecanada.com/utcfs/Templates/Pages/Template-53/0,8062,pageId%3D2763%26siteId%3D463,00.html
I ended up purchasing the Bacharach Leakator 10.
It is a solid unit and so far has proven to be quite accurate and reliable, even with the slightest gas leak.
You probably made a good decision not buying TPi. I get this POS calibrated once a year and rarely use it, yet everytime I switch to gas leak detection it locks out with an error.
Junk!