How to use a mechanical scale correctly?
A mechanical balance is an instrument used in construction and various engineering applications to measure the inclination of a surface relative to the Earth's gravity.
It consists of a sealed, transparent tube containing a liquid (usually colored alcohol) with a bubble inside. The tube is mounted to a frame by at least one magnetic strip or set of magnets.

Here's how it works:
1. Bubble and liquid: The tube is partially filled with liquid and there is a small air bubble inside. The bubble in the liquid indicates the level or slope of the surface.
2. Reference marks: The pipe usually has reference marks along its length. When the bubble is centered between these marks, the surface is level.
3. Magnetic property: Magnetic strips or magnets attached to the scale allow it to stick to ferrous surfaces. This magnetic feature helps maintain levelness during measurements.
4. Reading the Level: To use a magnetic spirit level, you place it on the surface you want to check. Adjust the surface until the bubble is centered between the reference marks. This ensures the surface is level or at the desired slope.

Magnetic spirit levels are especially useful in situations where it is difficult to hold the level by hand, as the magnetic feature helps to secure the level to metal surfaces.
These tools come in a variety of sizes, from small hand scales for household use to larger construction projects. Some may also include additional features, such as laser scales for more accurate measurements over long distances.
Please note that proper calibration is essential to ensure accurate readings, and it is a good idea to periodically check the scale to confirm its accuracy.
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