measuring rear axle length?

Well I'm fairly new to this mountain biking lark but due to reliability issues an the fact I like shiney bits I'm in the market for buying some new wheels. I have been looking at hope pro 2 evo hubs on mavic 521 rims. I have come to ordering an it has asked me for the rear axle length (either 135 or 150mm). So I got some vernier caliper on the job an removed the skewer an sent the gauge down the inside to measure it an its showing 146.7mm? I imagine I am measuring the right section. Any help on this subject would be much appriciated.
Cheers Dan
Cheers Dan
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Parktools :?:SheldonBrown