Vertical jump measurement system

A vertical jump measuring system comprising:

• an inner slide assembly including an inner slide member, an indicator rod, and a plurality of indicator members, wherein the indicator rod is coupled to the inner slide member and the plurality of indicator members are rotatably coupled to the indicator rod;
• the inner slide member comprises an inner slide member top end, a “T”-shaped transverse cross-section, an inner slide member top guide, and an inner slide member detent assembly, wherein the inner slide member top guide is disposed at the inner slide member top end and the inner slide member detent assembly is coupled to and disposed toward the inner slide member top end;
• the inner slide assembly is coupled to and disposed within a first inner channel member, the first inner channel member comprises a first inner channel top member top end, a first inner channel member bottom end, a “C”-shaped transverse cross-section, a first inner channel top cap, a first inner channel bottom cap having an inner slide member opening, a first inner channel member detent feature, and a first inner channel detent assembly, wherein the first inner channel top cap is disposed at the first inner channel member top end, the first inner channel bottom cap is disposed at the first inner channel bottom end, the a first inner channel member detent feature is disposed toward the first inner channel top end, and the first inner channel detent assembly is disposed towards the first inner channel member top end, further;
• the inner slide assembly, in a first state, fixed in an inner slide assembly retracted position along a first inner channel member vertical axis, in the inner slide assembly retracted position, the inner slide member detent assembly engages the first inner channel member detent feature and holds the inner slide member in a fixed position, in an inner slide assembly transition state, the inner slide member detent assembly is disengaged from the first inner channel member detent feature and may freely traverse the first inner channel member vertical axis towards the first inner channel member bottom end through the inner slide member opening and in a second state, the inner slide assembly is stopped at the inner slide assembly extended position by an interference between the inner slide member top guide and the first inner channel bottom cap;
• the first inner channel member is coupled to and is disposed within an outer channel member, the outer channel member comprising an outer top cap disposed at an outer channel member top end, an outer channel bottom cap having an inner channel member opening disposed at an outer channel bottom end, and an outer channel member detent feature disposed toward outer channel member top end, further the outer channel member comprising a “C”-shaped transverse cross-section;
• and
• the first inner channel member, in a first state, fixed in a first inner channel member retracted fixed position along an outer channel member vertical axis, in the first inner channel retracted position, the first inner channel member detent assembly engages the outer channel member detent feature and holds the first inner channel member in a fixed position, in first inner channel transition state, the inner channel member detent assembly is disengaged from the outer channel member detent feature and may freely traverse the outer channel member vertical axis towards the outer channel member bottom end through the inner channel member opening and in a second state, the first inner channel member is stopped in the first inner channel extended position by an interference between the first inner channel member top cap and the outer channel member bottom cap.