 AstroClassifieds.com |
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For Sale By
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Views
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Date Posted
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John Duchek
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605
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Fri April 13, 2007
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Asking Price
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Condition
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Distance from you
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Contact Seller
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New
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Description:
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I don't sell these, but the idea is just too useful to not pass along.
IR thermometers make a great clear sky meter. I just purchased a
Cen-Tech non-contact pocket thermometer for $9.99 (normally $19.99) at
Harbor Freight. Its range is -27 to 230 F and it also has a clock and
stopwatch for the money. If you point it at external objects you get
the temperature of the object. Point it at clouds and you get the temp
of the cloud bottoms. (last few days here have had the clouds at
around 32 deg while the temp of objects is around 45-55. This morning
I pointed it a clear sky and got a reading of -26 deg. there were a
few very thin clouds and I pointed at them and got 1 degrees. So here
is a temperature sensor that allows you to quantitatively determine
sky clearness.
(Note this is not a dark sky meter, but a measure of cloud/haze density)
All for $10. For whatever that is worth,
John
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Keywords:
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clouds clear sky haze meter
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