On Thu, 01 Jun 2000 in "Re: [EE]: [PIC]: How to measure level of liquids and sense", you wrote: I don't know if this has been mentioned before as I've not been following this until I noticed a system that uses two metal rods that are placed into the liquid. The resistance is measured and as the liquid rises the resistence drops. Now this will probably only work for water based liquids, but does look to be a very quick solution... Ian. -- Hofstadter's Law: The time and effort required to complete a project are always more than you expect, even when you take into account Hofstadter's Law. Uptime at 3:28am up 1 day, 11:20, 4 users,