| CPC G02B 6/4298 (2013.01) [G01M 11/3154 (2013.01)] | 20 Claims |

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1. A coupler comprising:
a body comprising:
a first end couplable to an external connector comprising an external ferrule,
a second end couplable to an internal connector, comprising an internal ferrule, of a test device, and
a cavity; and
a first replaceable portion comprising a replaceable ferrule, the first replaceable portion positioned in the cavity and manually replaceable with a second replaceable portion positionable in the cavity, wherein the first replaceable portion further comprises a sleeve securely fitted with the replaceable ferrule, wherein a first end of the removeable ferrule is contained in the sleeve, the sleeve comprising a space into which the internal ferrule of the test device is insertable.
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