From my experience, stricly dog and cat since I am a vet tech by trade, the top two companies are homeagain and avid... both can be scanned at an aproximate distance of 8 inches but its best obviously to have contact with the animal you are trying to scan, in accordance to your other question you need a veterinarian to inject the microchip into the animal barring extenuationg circumstances ie: a hot the vet doesnt want to deal with in hosptial

hope that helps out

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• Microchip implant - Upscale, Sun Apr 2 15:26:28 2006
• RE: Microchip implant - PatrickR, Sun Apr 2 15:32:31 2006
• My $.02 - SnakesAndStuff, Sun Apr 2 17:53:25 2006
• On the flourescent dye... - SnakesAndStuff, Sun Apr 2 17:54:43 2006
• RE: Microchip implant-on Trovan chips - Ryan Shackleton, Tue Apr 4 00:16:03 2006
• RE: Microchip implant-on Trovan chips - joeysgreen, Thu Apr 6 17:30:01 2006