I have a question about rope diameter. Today I was looking at my ropes and something cought my eye. At glance my 7,8 Master Tendon looked thicker than my 8mm Beal Rando. So I took vernier caliper and measured the diameter of this two ropes. Indeed Tendon Master 7,8 was thicker than Beal Rando 8mm. How is the diameter of ropes measured? What am I missing? Sorry if this has been discused before.