http://www.soapcrafts.org/flat-lid/
Looking to find two things: a humidiguide (registers humidity levels) and flat pan lids for cookware?
Humidity guide is like a thermometer but registers the humidity level in a room. The pan lids, they use to come three to a pack in three different sizes with a ring or knob in the center.
Try "hygrometer" and "universal pan lid" or "universal pot lid"
http://www.windandweather.com/store/Weather_Instruments___Hygrometers?Args=
http://www2.oregonscientific.com/shop/product.asp?cid=2&scid=5&pid=646
http://www.shophometrends.com/product.asp?pn=611060&bhcd2=1188875692
http://www.williams-sonoma.com/products/cw262/index.cfm?bnrid=3100117&cm_ven=WS&cm_cat=General&cm_pla=SiteMap&cm_ite=Products&CM_REF=http%3A%2F%2Fwww.google.com%2Fsearch%3Fq%3Duniversal%2Bpan%2Blid%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla%3Aen-US%3Aofficial%26hs%3DIPj%26start%3D10%26sa%3DN&flash=on
(the most common universal lid in our kitchen is a Corelle plate)
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