Special purpose vibration sensor is a sensor used to measure, analyze, and display linear velocity, displacement, and acceleration. It can have from one axis to three axes of measurement. It is available in various forms. It can be used on a stand-alone basis, or in conjunction with a data acquisition system.

Special Transducers are used to detect the sound waves. Special transducers are known for recording telephone conversations conducted with hand-held telephone receivers. Special transducers are made for a variety of demanding applications and involve miniature scale or high capacities. Special transducers are available for non-magnetic applications. Special transducers are available in which the electrical conductivity of a membrane changes with water vapor pressure are available.

Special type weight indicator is used on larger rigs. It can also be used as a stand-by weight indicator. It indicates total hook load directly in pounds. The adjustable damper valves allow for sensitivity adjustment to cut down on the fluid pulsation and thereby reducing pointer whip. This instrument also has a vernier pointer with 6 to 1 ratio, which is an important aid in such jobs as fishing. It includes a weight indicating gauge with duplex and movement, a protective steel cabinet with 2 doors, and a dead line diaphragm with C-clamp.