An instrumentation amplifier is a switched gain precision operational amplifier. This is used for precise and accurate, low-noise differential signal acquisition. 4mm sockets are used for the input signal. It can be interfaced with a wide range of sensors. It can take small voltage changes from a sensor and make those changes large enough to be measured using CRO. It is not able to drive a low-impedance load such as a loudspeaker or relay. The output can be read on CRO. A digital multimeter may also be used to read the output. With the switched gain of 5 to 1000, it can handle signal inputs over a very wide range making it suitable for almost all applications.