Small-range precision waterproof roll thickness gauge

The utility model provides a waterproof roll thickness gauge with small range precision, which comprises a micrometer, the micrometer is fixedly mounted in an annular mounting box, the top of the annular mounting box is provided with an opening, the bottom of the annular mounting box is provided with a clamping groove, and a probe of the micrometer is positioned in the clamping groove; the upper end of one side of the annular mounting box is fixedly connected with a first arc-shaped handle, the bottom of the first arc-shaped handle extends to the position below the probe, and the tail end of the probe and the top of the first arc-shaped handle located below the probe are fixedly connected with pressing discs; a mounting seat is fixedly connected to the bottom surface of the first arc-shaped handle, two first arc-shaped rods are symmetrically arranged on one side of the mounting seat, rotating and fixing blocks are fixedly connected to the bottoms of the first arc-shaped rods, the bottoms of the rotating and f