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<DIV><FONT face=Arial size=2>You can have a hygrometer calibrated: <A
href="http://www.troemner.com/cal_humidity.htm">http://www.troemner.com/cal_humidity.htm</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Or you can by one that has been tested to meet
certain standards.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Also, look at the specs for your hygrometer, most
have a limited range of relative humidity for their stated accuracy - accuracy
falls off at very high or low levels.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Terry Farrell</FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=john@musselwhite.com href="mailto:john@musselwhite.com">John
Musselwhite</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">Pianotech List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, April 26, 2007 10:45
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Data logger</DIV>
<DIV><BR></DIV><FONT size=3>At 07:16 PM 4/25/07, Marcel wrote:<BR><BR>
<BLOCKQUOTE class=cite cite="" type="cite">Hello,<BR><BR>I've not used this
one but have heard good reports about it. The price is<BR>right<BR><BR>Check
their website at: <A
href="http://www.microdaq.com/lascar/el-usb-2.php"
eudora="autourl">http://www.microdaq.com/lascar/el-usb-2.php</A></FONT></BLOCKQUOTE><BR>I
have one (it's a Measurement Computing USB-502) and use it a fair amount,
mostly in churches and the concert hall I look after, but I've left it in
homes as well occasionally. Find it at:<BR> <A
href="http://www.measurementcomputing.com/cbicatalog/USB-502.asp?dept_id=414&pf_id=1759"
eudora="autourl">
http://www.measurementcomputing.com/cbicatalog/USB-502.asp?dept_id=414&pf_id=1759<BR><BR></A>It
seems to work well, but it gives me dramatically different readings from those
taken with my digital psychrometer, a Cooper SRH122. While the USB-502 can
give me stored readings lately of around 20% RH the Cooper has told me
it's more like 10%-12%. One church with a C7 I look after read in the high
teens on the USB, but the Cooper said it was 3.8% (+-4%) at the piano! The
Cooper can be found at: <BR><A
href="http://www.tempsensor.net/modules.php?op=modload&name=News&file=article&sid=406"
eudora="autourl">http://www.tempsensor.net/modules.php?op=modload&name=News&file=article&sid=406<BR><BR></A>A
Dampp-Chaser with two tanks is being installed on that C7 next week.
<BR><BR><X-TAB> </X-TAB><X-TAB>
</X-TAB>John<BR><BR><X-SIGSEP>
<P></X-SIGSEP>
<DIV align=center><FONT size=3>-------------------------------<BR>John
Musselwhite, RPT - Registered Piano Technician<BR>Musselwhite
Piano Services - Calgary, Alberta Canada<BR>Office/cel (403) 246-7717 Fax
(403) 255-5268<BR>Outside of Calgary call Toll Free: 1-866-95-PIANO
(1-866-957-4266)<BR>"Three Generations of
Experience"<BR></FONT></DIV></BLOCKQUOTE></BODY></HTML>