Tamper Evidence Marker Blue. Provides a convenient visual method for identification of vibratory loosening or tampering in nuts bolts fasteners and assemblies. Highly visible under ambient light and fluorescent under UV light. Tamper proof torque mark. Safe for most surfaces. Excellent adhesion. Color: Blue. Capacity Vol.: 1 oz. Length: 2. Packing Type: Tube. Height: 1/2. Width: 1.