A linear traverse mechanism for guiding the spooling of a flexible linear product at high speed, made possible by reducing the inertial load of the mechanism while reducing the angular deflection of the filament. The card detection pin is for the prevention of mutual interference caused by the memory cards connected with shared pins of the control chip. A correction portion 106 calculates a specular reflection coefficient Ks, a glossiness coefficient p, and first and second diffuse reflection coefficients Kd1, Kd2 by using parameter fitting so that the error between the reflection property of the actual yarn and the energy of the reflected light obtained from a reflection function becomes minimum. The breakdown voltage of the ESD protection apparatus is tunable by adjusting the length of the first isolation region. The filter casing can include a drain line leading from the filter casing drain to a pan outside the refrigerated space. The peptide derivative is represented by the following general formula ,where polypeptide ExP is polypeptide that contains completely or partially the amino acid sequence of exendin-4, and a -L-Z group represents a group represented by the following formula that is bonded to an amino acid side chain of or the \u03b1-amino group at the N-terminus of the polypeptide ExP,.