Cast-in-place concrete depth measuring rod

A cast-in-place concrete depth measuring rod possesses a long rod of which the surface is equipped with the scales and the interior is hollow, the top end of the long rod is in spiral and fixed connection with an upper cover, and the bottom end of the long rod is fixedly connected with a tapered detection head. A battery box and a bulb are connected at the central position of the interior of the upper cover, and a battery in the battery box is electrically connected with the bulb. A switch button of the bulb is in matching connection on the upper end face of the upper cover, green transparent slice marks are embedded on the outer surface of the long rod, and a sliding sleeve capable of sliding up and down sleeves on the periphery of the long rod. The lower end of the sliding sleeve is connected with a circular ring-shaped horizontal circular ring, the two sides of the horizontal circular ring are fixedly connected with the sliding sleeve via a supporting rack, and the sliding sleeve is fixed to the long rod via screws. The measuring rod can measure the thickness of the cast-in-place concrete by day accurately, also can be used at night, is simple in structure, is compact, light, convenient and rapid, can be used circularly, and can grasp the thickness design requirement of a cast-in-place concrete member accurately.