You might try the APC enviro sensor for about $225. They also make an upgrade kit if you already own an APC smart UPS with a network card. APC also offers their Netbotz line - a company they bought, but those products are a bit more expensive. -- James <div class="gmail_quote">On Thu, Dec 9, 2010 at 12:16 PM, Furnish, Trever G <<a href="mailto:TGFurnish@herffjones.com" target="_blank">TGFurnish@herffjones.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> Can anyone recommend a low-cost external temperature sensor that doesn't require the buyer to break out a soldering iron? Preferably it would be SNMP-enabled so I can poll it from anything. Power-over-ethernet would be great too. The least expensive snmp-enabled sensor I've found so far is this one at 195 USD: <a href="http://avtech.com/Products/Temperature_Monitors/TemPageR_3E.htm" target="_blank">http://avtech.com/Products/Temperature_Monitors/TemPageR_3E.htm</a> I've also noted probes like this one at 15 USD: <a href="http://www.ibuttonlink.com/t-sense.aspx" target="_blank">http://www.ibuttonlink.com/t-sense.aspx</a> ...but the systems in the site where I'd hook this up are all Windows, so I'm not sure how I'd get from there into Nagios. -- Trever Furnish, <a href="mailto:tgfurnish@herffjones.com" target="_blank">tgfurnish@herffjones.com</a> Herff Jones, Inc. Solutions Architect Phone: 317.612.3519 Any sufficiently advanced technology is indistinguishable from Unix. </blockquote></div>