Beam bottom steel bar protective layer thickness measuring device

The utility model relates to a beam bottom reinforcement protective layer thickness measuring device, which comprises a sleeve, a core rod, a contact pin and a scale pin, two axial ends of the core rod are respectively an operation end and a contact end, the contact pin and the scale pin are respectively vertically fixed on the core rod, the contact pin is arranged close to the contact end, and a first preset distance is reserved between the contact pin and the contact end. The scale needle is arranged close to the operation end, and a second preset distance is reserved between the scale needle and the operation end; the sleeve is provided with a first kerf and a second kerf, the first kerf and the second kerf are parallel to the axis of the sleeve, the first kerf penetrates through the contact end, and the second kerf penetrates through the operation end; the core rod is sleeved with the sleeve in a sliding mode, and the contact pin and the scale pin are arranged in the first kerf and the second kerf in a sl