T&T: Holding Tank Monitors

[Peter McCorison (t)]

It's time to install a level sensor in COHO's holding tank. By Googling 
around, I've come up with the two links below (eliminating Snake River 
because of reported reliability problems).

Does anybody Have any experience with Xintex Level Sensors:

http://www.fireboy-xintex.com/liquid-level-monitors.htm#M

Or the system marketed by Fierello Sales:

http://www.ferriellosales.com/default.php

Or are there any other recommendations?

TIA,

Peter McCorison
50' Marco trawler yacht COHO
Orcas Island, WA