"Fred McKenzie" wrote in message
...
| Mechanical meters often rely on such things as horse hair, pieces of
wood
| and similar organic things to indicate humidity. For accurate results use
a
| wet and dry bulb system with a psychrometric chart.
|
| N-
|
| I agree. However, I have an inexpensive version of the wet-dry system
that may
| be as bad as the horse hair. It consists of two thermometers with one
having a
| wick attached to the bulb, fed by a water reservoir. It has a conversion
| matrix printed on the mounting plate. Comparing with several other
sources
| suchas electronic guages and TV weather reports, it tends to be ten to
twenty
| percent off.
|
| The electronic humidity guages may only be within five percent, but that
is
| much better than some of the alternatives.

Add a small fan and you have a true wet and dry bulb system which IS
accurate. Remember it is reading in your house (I assume) which won't match
the local airport.

N