Looks great Sam, always fun with something new to "play" with !
I just had a look at your website and it seems like your new sensor is working just fine.
A company here in Sweden, are selling a sensor with a probe (like your one) for the WMR100, but, it is nearly 3 times more expensive than a regular one.
Wonder what happens if I just dig a hole sensor down ? I guess its hard to get a good connection.
Has anyone tried this ??
Andy