Abstract: An apparatus and a method that provides a helmet cap with an embedded visor on the inside of said helmet cap to train a wearer of a football helmet to correctly position the head in an up position when tacking and blocking during sports play. The cap can be detachably but securely attached to a football helmet and upper facemask in a position where it does not obstruct the view of the helmet wearer to a position where it does obstruct the helmet wearer's view and thus forces the helmet wearer to look up.

Abstract: Disclosed is an elastic exercise strap with a gripping portion that merges into a loop or aperture. The strap can be connected to a sports helmet by threading the extended gripping portion around a part the helmet and then inserted through the loop or aperture. By pulling on the attached strap the neck muscles can be exercised.

Abstract: Disclosed is an elastic exercise strap with a gripping portion that merges into a loop or aperture. The strap can be connected to a sports helmet by threading the extended gripping portion around a part the helmet and then inserted through the loop or aperture. By pulling on the attached strap the neck muscles can be exercised.

Abstract: A calibration unit, system, and method for calibrating a device under test are provided. The calibration unit, system, and method use a single axis rotational unit to calibrate devices under test on a test head. The single axis rotation unit is configured to extend at an angle from a known axis. The test head can be designed in the shape of a frustum with multiple sides. The calibration unit, system, and method can use combinations of gravitational excitation, Helmholtz coil excitation, and rotational rate excitation for calibrating the device under test. The calibration unit, system, and method can calibrate a 3 degree for freedom or higher MEMS devices.

Abstract: A calibration unit, system, and method for calibrating a device under test are provided. The calibration unit, system, and method use a single axis rotational unit to calibrate devices under test on a test head. The single axis rotation unit is configured to extend at an angle from a known axis. The test head can be designed in the shape of a frustum with multiple sides. The calibration unit, system, and method can use combinations of gravitational excitation, Helmholtz coil excitation, and rotational rate excitation for calibrating the device under test. The calibration unit, system, and method can calibrate a 3 degree for freedom or higher MEMS devices.