<div dir="ltr">Hey Derek, <div><br></div><div>I  have a question regarding the data-logger you describe. If the thing is buried in the wall, would one have to abandon it when the battery runs out?</div><div><br></div><div><br><div class="gmail_extra"><div class="gmail_quote">On Mon, Nov 2, 2015 at 4:35 PM, Derek Stearns Roff <span dir="ltr"><<a href="mailto:derek@unm.edu" target="_blank">derek@unm.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">



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Those of us who want to monitor the conditions inside our walls have had a variety of options, from home-built to industrial, at a range of prices.  However, finding a system that meets a home builder’s definition of easy and affordable has been elusive.  I
 just found a product advertised at Lee Valley Tools, which shows that the consumer market is beginning to offer interesting options.  Powered by a CR2032 battery, the device will log data, and transmit it to an iPhone or other iOS device for “up to a year”.
  Important details are missing, but it looks interesting.  The D2 model costs $159, and measures temperature accurate to 0.5 degrees C, and humidity, accurate to 2%, according to the web page.  The device appears to be about 40mm long, 35mm wide, and 13mm
 thick.  
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<div><a href="http://www.leevalley.com/US/wood/page.aspx?p=73503&cat=51&ap=2" target="_blank">http://www.leevalley.com/US/wood/page.aspx?p=73503&cat=51&ap=2</a></div>
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<div>Derek<br>
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<span style="color:rgb(0,0,0);font-family:Helvetica;font-size:14px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline!important;float:none">Derek
 Roff</span><br style="color:rgb(0,0,0);font-family:Helvetica;font-size:14px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<span style="color:rgb(0,0,0);font-family:Helvetica;font-size:14px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline!important;float:none"><a href="mailto:derek@unm.edu" target="_blank">derek@unm.edu</a></span><br style="color:rgb(0,0,0);font-family:Helvetica;font-size:14px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
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