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Digital screen. Such a device is suitable as a way to demonstrate the process, since the actions are visible on the display. But the cost increases significantly, almost all models are connected to external monitors. What should be a good microscope:
They are a glass flask sealed on both sides. Inside — a capillary with mercury and a scale of 34-42 C. Mercury expands when heated and rises up through a special tank. The reading at the top point is maintained until the thermometer is shaken. Such devices are also called maximum.
Far from the last indicator in choosing the best tonometer is the manufacturer and its recognition. After all, today many pharmacies offer products of unknown brands. Buying such a product, you can run into a low-quality product, the manufacturer of which does not even have a specialized service center.