I was given a used Hova-bator, I think it is the thermal air flow model but not sure due to most of the label stickers are gone. It has a few missing things but should be easy to replace and it also needs a new wafer. What I need is if anyone can direct me to an online manual or something so I can be sure as to what all is missing and also learn how to operate it, Ive looked and cant seem to find a manual for it, and second were to find least expensive wafers? Thank you all ahead of time for your answers and taking the time to reply to my post...I am really wanting to get into this and want to learn!!! Ok, I have a list of the things I need to get for this thing. Should I go ahead and order a couple of wafer's? Do they need to be replaced often?