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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