Is there a backflow device?

Don't Radon tests require a device to be left for 48 hours?

You can certain do stuff like checking which breaker operate which device or fixture, so you can turn on/off the proper circuilt.

Thanks everyone.Our plumber said that no such reliable vent conversion device exists (I thought I saw one on This Old House, but I may be mistaken).  

Couple years ago on a rehab we were having trouble with vandals.We put in both covert and overt video recording devices and let the neighborhood know.The trouble stopped; although the vandals would march by and give the finger to the overt camera.

They used to have a code that made it easy to access but now they have a scanniing device and key bar code that gives entry and is changed often.Just ask for a listing of everything on the market over 6 months old etc.

Fraud consists of some deceitful practice or willful device, resorted to with intent to deprive another of his rightin some manner to do him an injury.

I had a tenant ask if I would device their lease into to leases?  

I also know that they have some robo cop looking device he will wear when he is walking around.I will get you the info.AC

It would seem to me that water or water purification devices/tablets would make more sense.