# On the Internet, find a device for measuring blood pressure – a mechanical tonometer.

On the Internet, find a device for measuring blood pressure – a mechanical tonometer. Determine the scale divisions. In what units is blood pressure measured?

depicts the scale of a mechanical tonometer. Below, near the tip of the arrow, we see the inscription mmHg. This means that blood pressure with this device is measured in millimeters of mercury. To determine the scale division value, select any two signed labels and count the number of divisions between them. Let’s say we chose 20 and 40. Between these two marks there are 10 divisions (spaces between the marks).
The division price will be:
(40 mmHg – 20 mmHg) / 10 divisions = 20 mmHg Art. / 10 divisions = 2 mm Hg. Art. / division.

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