I just purchased one yesterday from a NAPA autoparts store in Palm Beach Gardens, FL. Mine is a Raycheck MiniTemp and sold for $89.00 plus tax. It bears a ratio of 6:1, meaning that as the distance increases the larger circle will be measured, hence with less pinpointed accuracy. NAPA carries several guns. The greater the ratio the higher the price. My interest in this laser pyrometer was tweaked by Dave Dreussi of Dave's Mobile Marine Repairs, Ft. Myers, when he demonstrated one during his session "Marine Diesels: Tips for trouble-free operation" at the Melbourne, Florida TrawlerFest. He did so again at "Diesels 101 for Women" the following day. Both sessions were extremely informative and I should recommend his sessions to all attendees at future TrawlerFests, if he is on the program. The usual caveat applies here: I have no commercial interest in NAPA, Raytech or Dave's Mobile Marine Repairs. Capt. Howard W. Evirs, Jr. M/V White Squall Sea Ranger '46 Sun Deck Trawler (open to Trawler Crawl at Melbourne)