"
Hmm, how could you measure your 'scope's magnification by looking
through the eyepiece? The only way I can see to do it
would be if you could gauge the apparent angular field (tricky,
but less prone to illusion than looking at tiny objects on the field),
then measure the true field by turning off the clock drive (if any)
and timing passage across the field.

Any better ways?

Stuart Levy

The travel across the FOV will work...I will try that. Thanks