A tablet adapted to be combined with a rod holder is provided. The tablet comprises a device body with a first surface and a second surface. The device body includes a first side edge, a second side edge adjacent to the first side edge, and a support area located at a joint of the first side edge and the second side edge. A through hole extending through the first surface and the second surface is formed at the support area. When the rod holder is inserted through the through hole to be combined with the device body, an end of the rod holder abuts against a supporting surface, and a support angle is formed between the device body and the supporting surface via the other end of the rod holder.