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In contrast to power and energy meters, which can directly measure the loss of fiber optic cable equipment, optical time domain reflectometers (OTDR) work  indirectly. Optical Time Domain Reflectometer (OTDR) is made according to the principle of backward scattering and Fresnel inversion of light, using the backward scattered light generated when the light propagates in the optical fiber to obtain information about the attenuation, thus indirectly measuring the loss and fault location of optical fiber cables.

Handheld metal detectors are designed to detect metal objects carried by people or objects. It can detect weapons, explosives, or small pieces of metal in packages, luggage, letters, fabrics, etc. carried by people. The special appearance of its sensitive surface allows easy handling. Superior to ring sensor hand probes. Ultra-high sensitivity, special application. Such as prisons, chip factories, archaeological research hospitals, etc. Handheld metal detectors are used to detect the specific location of metal carried by a person.

The oilfields are scattered and the oil wells are unevenly distributed, often several kilometers or even dozens of kilometers away from the oil plant. Therefore, the pipelines for transporting crude oil and natural gas are spread all over the oil region. It is difficult to obtain the oil/gas production of each well and each region in real-time. In the past, the oil production stations, combined stations, and sales and sales offices of major oil fields mostly used the form of filling in reports at each oil production station to count the oil/gas production volume of each well and each area every day and then obtained the monthly production by accumulating. This method not only It takes a lot of manpower and material resources, but it is easy to make mistakes, and it is also seriously delayed in time. It is difficult for oil production plants and oil fields to dynamically grasp the oil production situation of each well or even each area, and it is difficult to respond quickly to emergencies. even cause major losses. Therefore, it brings a lot of inconvenience to the oilfield management and has a great impact on the improvement of the overall benefit of the oilfield. The combination of paperless recorders and wireless communication technology effectively solves these problems.

A turbine is placed in the center of the pipe, supported by bearings at both ends. When the fluid passes through the pipeline, it impacts the blades of the turbine flowmeter, generating a driving torque to the turbine flowmeter, which makes the turbine flowmeter rotate by overcoming the frictional moment and fluid resistance moment. In a certain flow range, for a certain fluid medium viscosity, the rotational angular velocity of the turbine flowmeter is proportional to the fluid flow velocity. Thus, the fluid flow rate can be obtained through the rotational angular velocity of the turbine flowmeter, so that the fluid flow through the pipeline can be calculated.

An electromagnetic flow meter (EMF for short) is an instrument that uses the principle of electromagnetic induction to measure the flow of conductive fluid based on the electromotive force induced when the conductive fluid passes through an external magnetic field.

An oscilloscope is a laboratory instrument commonly used to display and analyze the waveform of electronic signals. In effect, the device draws a graph of the instantaneous signal voltage as a function of time. An excellent oscilloscope for testing and analysis, an oscilloscope is a must-have for many industries and applications such as RF design, general electronic circuit design, electronics manufacturing, service, repair, and more.