geological multi-purpose compass
Medieval Distance Measuring Compass
DT830D digital multimeter
Micrometer during the Soviet era
Geiger Miller counter
The Geiger M ü ller counter, also known as the Geiger counter, is a counting instrument specifically designed to detect the intensity of ionizing radiation (alpha particles, beta particles, gamma rays, and X-rays). Using an inflatable tube or chamber as a probe, when the voltage applied to the probe reaches a certain range, each pair of ions produced by ionization of the radiation inside the tube can amplify and generate an electric pulse of the same size, which is recorded by the connected electronic device, and thus measure the number of rays per unit time.
3D model of multimeter
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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