Thanks I will add if testing goes well. Yes I am using on an XO. <div class="gmail_quote">On Wed, Feb 16, 2011 at 8:11 PM, <<a href="mailto:forster@ozonline.com.au">forster@ozonline.com.au</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">> I am working on a project where kids will measure tempature and humidity as > part of testing and designing solar stills. > > What kind of jack do I need to connect to my sensors? > I assume I plug it into the microphone jack and that should work with the > Etoys World Stethescope. </div>Steve You need a 3.5mm phono plug to plug into the microphone socket, more detail <a href="http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors" target="_blank">http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors</a> If you get a humidity probe working please add it to this page Tony </blockquote></div>