Used these on railroad equipment in a past life. http://www.schaevitz.com/products/inertial/index.html These might be a little cheaper: http://www.schaevitz.com/stock/quote.html#Tilt Sensors chuckc On Mon, 9 Sep 2002 07:18:51 -0500 Terence Gunderson wrote: Greetings and thanks in advance for any and all input: I need to have a platform automatically level itself. I am looking for a suitable sensor to electronically sense when the platform is at level. The output of the sensor will be input to a micro the micro will then adjust jack screws until it sees a level condition. Terry -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body