Re: [humidity gauges]
From: Kevin Christiansen[SMTP:kevin+-at-cs.cmu.edu]
Sent: Tuesday, December 09, 1997 10:57 AM
To: Tesla List
Subject: Re: [humidity gauges]
At 11:35 PM 12/6/97 -0600, you wrote:
>From: Jim Lux[SMTP:jimlux-at-earthlink-dot-net]
>Sent: Saturday, December 06, 1997 11:30 AM
>To: Tesla List
>Subject: Re: [humidity gauges]
>> A few months ago Fair Radio Sales, Lima, OH, had some nice 6 inch dia.
>> humidity gauges for about $10. We added one to the lab wall about 3
>> ago and it works great -- use it more for checking performance on Van de
>> Graaffs than on TC's, but you can always check the RH in your lab and the
>> cost if reasonable.
>Radio Shack also has battery powered hygrometer/thermometer combinations
>for about $20. We make clouds and fog a lot at work, and find that the RS
>units work just fine for standardizing conditions. Of course, they aren't
>sensitive to glycol vapors which is what we use for some fog, but, oh
If you want precision at low humidities, the Radio Shack unit doesn't
cut it. I can't get my Radio Shack unit to read less than 19% humidity
no matter what I do (and that includes enclosing it in a jar with
1/4 pound of just-dried anhydrous calcium sulphate, which is a very
Just so you know....
- Kevin Christiansen
Kevin D Christiansen
Human Computer Interaction Institute - Carnegie Mellon University
"The universe is composed of space, galaxies, and intergalactic
dust. Galaxies themselves are composed of space, stars, and
interstellar dust. From the omnipresence of dust, we conclude
that nature abhors a vacuum and won't pick up a broom, either."