How to make a portable water level sensor

I wrote this article for eHow, and it was published a little while back.  I took a picture for the article reference which was not included when it was published.  Therefore, I am printing it here with a link to the article.

The picture shows some of the parts of the sensor.  The PVC fittings in the foreground are the 1 1/2" PVC Cap, the the 1 1/2" X 3/4" PVC adapter, and the 1/2" PVC cap and plug.  The silver object on the lower right is a sensor that I have used quite a bit for monitor wells. 


 The silver sensor was constructed from a 1" PVC cap and a 1" x 3/4" copper terminal end, with a float constructed of two 1/2" PVC caps glued together.  The reed switch is from a security system window sensor that mounts in a 1/4" hole, drilled in to the cap.  The sensor is hung by the long screw eye mounted in the top sensor.  The wire is a two conductor microphone wire that I am not sure is available anymore.

Here is the link to the article.  Have fun!