The exemplary embodiments relate to an autonomous temperature transmitter for use in process installations. The fouling detection instrument measures the weight of the filter assembly to indicate the degree of fouling. Branches extend from the convex point of one saw-shaped protrusion toward the apex to the other saw-shaped protrusion, and another branch extend from the point where the protrusion meets the boundary of the pixel electrode toward the point where the boundary of the pixel electrode and the saw-shaped protrusion make an acute angle. Each embedded slot game will have its own paytable, and may be a miniature version of a well-recognized full-sized slot machine game. Even when a high-strength workpiece is bent, it is possible to effectively obtain a product having excellent shape fixability and uniform hardness distribution at low costs for wide application for bending sophisticated automobile parts.