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Each of our headgear modules have 12 precise marks on each strap. The marks are 2 mm apart. Please note the example is activated to the 5th mark. This tells you:
1) The headgear is extended 10 mm. The strap can extend 12 mm more before the latch releases.
2) The force applied by your headgear from the charts below.
(Light force chart available upon request)
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