i've just completed a search on front rotor thickness and didn't get the info i needed.i know i could use a micrometer t spec the thickness but one isn't handy.there is one at the outlaws,but,well,you know.i have a gauge that would work fine to measure thickness if it wasn't for the lip that occurs on the outer edge of the rotors.so then it hit me!if i compare that edge to,say,a dimes thickness then i would have a good idea as to whether i change my rotors or not.assuming the rotors haven't been changed does this sound viable?can that lip be more than a dime and less than a penny?

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)