Thanks Alan see comments... ----- Original Message ----- From: "Alan B. Pearce" To: Sent: Monday, October 16, 2000 12:01 PM Subject: Re: [EE]: Help water level >>3. Continuous range from say 1 cm to say 30 cm deep, with 1mm accuracy. >Does it really need to be perfectly linear instead of stepped? No steps would work so long as the transistion from one step to another is good and repeatable. Seems to me like your solution would work fine in this case. Any info on the mechanical construction of this (like width of rod, how deep to make each step ec.) Andy -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.