nineteenth century instrument mapping surveying compass
The measuring compass was made around 1820. This is an instrument used to measure and map terrain. The measuring compass combines the functions of a compass and a measuring instrument and can measure angles and orientations for mapping and location determination. At the beginning of the 19th century, this instrument was widely used in geological exploration and engineering survey. This instrument was designed to make precise measurements in the field environment and was an important tool for geologists, engineers and surveyors at the time.
Medieval Distance Measuring Compass
DT830D digital multimeter
Micrometer during the Soviet era
3D model of pressure gauge
A pressure gauge is an instrument used to measure air pressure, which can be classified into many types. Among them, a tire pressure gauge is a type of tire pressure gauge, which consists of a head, piston, body, ruler, main spring, etc. The head only has one pressure measuring port, with a simple structure, small range, high accuracy, and easy use. It is suitable for measuring tire pressure in small vehicles such as micro cars and motorcycles.
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