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JDP－1型定盘式钻孔测斜仪（以下简称定盘仪）和JXC－1型磁性钻孔测斜仪（以下简称JXC仪）是两种用于有磁性干扰矿区的钻孔测斜仪，通称环测仪器。它们的测量原理都是以孔口（或孔内某点）走向和连环测量方法，通过公式计算来测定钻孔的方位角。这两种测斜仪，由于结构不同，当测具下孔后，前者每个点只能测一次，就要提上来，观测读数；后者是采用非电量电测法，测具在孔内可以连续多点测量。
JDP-1 type plate drilling borehole inclinometer (hereinafter referred to as fixing plate meter) and JXC-1 type magnetic drill inclinometer (hereinafter referred to as JXC meter) are two for the magnetic interference mining borehole inclinometer Instrument, known as the loop measurement equipment. Their measurement principle is based on the orifice (or a point in the hole) to the direction and the loop measurement method, the formula calculation to determine the azimuth of drilling. The two inclinometer, due to the different structures, when the test under the hole, the former can only be measured once for each point, it is necessary to mention, observe the reading; the latter is the use of non-electric power measurement method, measuring the hole Can be more continuous measurement.