Magnetometers... help?

[Nicko]

Back in 1970, I almost built the Leslie Huggard PM - I was 12 at the time... ;-) Nice to see that article archived - I almost considered updating the principle as I now work with DSPs etc.

Now, I'm looking at Carl's design. How sensitive is it? What will it give me that others won't (apart from ferrous selectivity)?

Thanks,

Nick