Roland,
Thanks for looking.
It seems whenever meters like the LC-100 are mentioned for use with HF Ls and Cs someone pops up inferring that the few 100s of KHz they use will give wrong readings.
I was looking for evidence that such inductors exhibited different values at different frequencies within their range but you have pointed out the simple fact that 500KHz is not suitable for measuring mains power components or VHF components.
Your link gives a good explanation and more detail. I think as you say these meters are very unlikely to be a problem for checking components specified for HF use.
73 Alan G4ZFQ