You can purchase a infrared gas detector online at Amazon.com, Buy.com or Ebay.com. It would be beneficial online, therefore you can compare prices, read reviews and return your product with no hassle.
I certainly understand your concern regarding carbon monoxide poisoning, and think it is a great idea to have a product that will detect carbon monoxide. You will not require an infrared gas detector for this. All you need is a carbon monoxide detector that can be purchased at places such as Home Depot, Lowes and Costco. We paid $40 at Costco, and it is guaranteed for 8 years.
http://www.grainger.com/ Is a great place to find a multi-gas detector. You can get one if you choose they are a good thing to have, if you feel it is necessary to your home.
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An infrared sauna can be a great therapy for pain management, one of it's greatest benefits is the ability to get the heat deep into the body without harmful side effects.
Metal Detector is a great website which offers junior metal detectors for sale. You can also purchase reasonably priced junior metal detectors from Wal Mart or Amazon.
Metal detecting can be great fun and quite rewarding, but the quality of detectors can vary so it is worth visiting review sites. A review of the Fisher is on the website Metal Detector Reviews.
The following website http://www.amazon.com/Innotek-Corporation-Handheld-Gas-Detector/dp/B000IKNRYS is a great reliable brand of carbon monoxide hand held detectors
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At Computergeeks.com I have found decently priced cameras for as low 23.00 each! They have a great assortment of infrared cameras, digital cameras, computers and SO much more!
A person can get an explanation on how to build a sauna from several different places. Some of these places include Great Saunas, YouTube, and Lifehacker.