Strain Gages is used for decades to measure the present tension or preload in bolts. It consists of two basic techniques to be used. The first technique is the gauges are mounted on the bolts themselves and in second they are mounted in washers placed under the head of the bolt or its nut. They use a length of gage wire to produce the desired resistance in the form of a flat coil. This coil is then cemented between two thin insulating sheets of paper or plastic. Such a gage cannot be used directly to measure deflection. It has to be first fixed properly to a member to be strained.

Strain Gages are designed to convert mechanical motion into an electronic signal. Strain gages are essential for taking measurements in automotive and aerospace applications. Strain gage is designed for arc welding to steel structures such as tunnel linings, excavation bracing, piles and bridges. Strain gages are used for manufacturing load cells and transducers as well as for applications in test & measurement equipment.

Strain gaging may be combined with nondestructive testing to provide reliability assessment of steel bridges where fatigue is a concern. Strain gage data may be employed to identify bridges and structural components most susceptible to fatigue cracking. Strain gage data may be incorporated into fracture mechanics/NDT analyses to insure that effective reliability assurance is provided and to assist in scheduling follow on nondestructive tests.

Strain pressure gauge is a device that exhibits a change of some electrical property when they are deformed by some external force. The pressure sensing tube is connected to a chamber or cavity whose floor is a relatively flexible diaphragm. The diaphragm is deformed by air pressure inside the chamber. This contains a primary transducer and a secondary transducer. These are used to measure elements that convert force, pressure and tension into an electrical signal.

Strain Sensors is a tool, used for monitoring processes and machines for many applications. The sensor features a very high charge output and comes with a separable steel braid cable. Strain sensors are useful in a wide variety of applications such as robotics, biomedical devices, fluid flow sensing and vibration dampening.

Strain survey is conducted for helping engineers to understand static and linearly moving parts designs can be improved to increase life and performance, while reducing material costs. These tests also used for rotating parts are considerably more difficult due to the very high "g″ load environment that both the device under test and the instrumentation must withstand. The device under test is usually designed and subjected to finite element analysis, which can locate and estimate nominal stress points. However, critical parts must be tested to verify actual stresses.