I didn't know you were such an artist! I checked and the digital instruments are way too expensive. Still looking.
<div class='quotetop'>QUOTE(SSimon @ May 22 2007, 02:51 PM) [snapback]447546[/snapback]</div> [blush] You shouldn't have to spend very much money to accomplish this.
I like the method a lot of people use to check the fuel level in lawn mowers, boats and even airplanes where you drop a stick in, pull it how and see how much of the stick is wet. Simple, but effective.