Yeah, mine came with a slide rule, too (also Abbeon). You can get down to 10% with dry bulb as high as 70 F. But the side that goes above 70F only goes as low as 30%. And the chart that came with it is missing a lot of the numbers I'd really like to have. This year I am getting particularly low readings on my digital, so was wanting to verify how accurate it is. So far it looks like the digital is plenty accurate. But the variance in rh #'s for different charts has me wondering who is making what calculations based on what. Regards, Fred Sturm John Ross wrote: > > Hi Fred, > When I got my unit, it came with a slide rule. Line up the wet and dry and > it points to the RH. > The address on it is, Abbeon Cal Incorporated, 123.SR Gray Ave., Santa > Barbara, CA 93101. > I think I origionally got mine from Pianotek. > Regards, > John M. Ross > Windsor, Nova Scotia. > jrpiano@win.eastlink.ca
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