A tool for measuring, marking, or cutting material, the tool formed of a rigid sheet of transparent material having a plurality of lines formed thereon, and a transparent, non-removable, slip-resistant coating applied to a working surface of the rigid sheet to resist slipping of the tool when applied to the material. A first plurality of mutually parallel ridges is affixed to the surface of the base layer. An additional conductor film which is at the same potential as the external conductor film is arranged such that it faces the external conductor film with an insulating layer disposed therebetween. Client devices may connect to the integrated network and perform a variety of functions. Thus, a liquid discharge recording head that enhances recording performance and that has superior productivity while maintaining reliability of the recording performance is provided.