1. Base: This is the sturdy platform that supports the entire balance.

2. Platform: This is the flat surface where the object being weighed is placed.

3. Beams: These are the three horizontal rods with sliding weights.

* Front Beam: This is the shortest beam and typically has the smallest weights (usually in increments of 0.1 grams).

* Middle Beam: This is the middle beam and has larger weights (usually in increments of 1 gram).

* Back Beam: This is the longest beam and has the largest weights (usually in increments of 10 grams).

4. Pointers: Each beam has a pointer that moves along a scale as the weights are adjusted.

5. Zero Adjustment Knob: This knob is used to calibrate the balance so that it reads zero when empty.

6. Scale: This is the graduated scale that displays the weight of the object.

7. Weighing Pan: This is the tray where the object to be weighed is placed. Some models might not have a separate pan, and instead have a platform that directly sits on the base.

8. Locking Mechanism: This mechanism is often found on the beams to lock the weights in place after they have been adjusted.

Here's how it works:

* Zeroing: First, you adjust the zero adjustment knob to ensure the balance reads zero with nothing on the platform.

* Weighing: Place the object on the platform and adjust the weights on the beams until the pointer aligns with the zero mark on the scale.

* Reading: Add up the weights on each beam to determine the total weight of the object.