Postal scales fall into a few families: digital, mechanical spring, balance beam and hanging models. Each measures weight differently, and each suits a particular kind of work. This plain guide defines them and gives an example use for each.
Digital Scales
A digital scale uses a sensor under the platform and shows the result on a screen. Most have a tare button, a unit switch and a hold function.
- Example use: a home seller weighing varied parcels each day.
- Good points: easy to read, quick, often has several units.
- Watch for: power source and whether the platform flexes under big loads.
Mechanical Spring Scales
A spring scale uses a spring that stretches or compresses under load, and a dial shows the weight. It needs no power.
- Example use: a workshop corner where a plug is not handy.
- Good points: simple, works without batteries.
- Watch for: the dial can drift over time, and the reading may be harder to judge between marks.
Balance Beam Scales
A beam scale compares the parcel against sliding weights along a beam. You move the weights until the beam sits level, then add up the markings.
- Example use: a shared space where a steady, simple instrument is wanted.
- Good points: few parts that can fail.
- Watch for: slower to use, and it needs a stable, level surface.
Hanging Scales
A hanging scale carries the parcel from a hook. It can be digital or spring based.
- Example use: bulky or awkward parcels that do not rest well on a platform.
- Good points: no platform size limit.
- Watch for: the parcel must hang still, and the hook and straps must carry the load.
Side by Side
| Type | Reads by | Needs power |
|---|---|---|
| Digital | Screen | Yes, batteries or adapter |
| Spring | Dial | No |
| Beam | Sliding weights and markings | No |
| Hanging | Dial or screen | Depends on the model |
Terms You Will Meet
- Capacity
- The heaviest load the scale is meant to carry.
- Increment
- The smallest step in the displayed reading, sometimes called resolution.
- Tare
- A function that sets the display to zero with a container on the platform, so only the contents are counted.
- Platform
- The surface on which the parcel rests.
Knowing these words makes maker’s guides much easier to read, and it helps when you compare two models side by side.
FAQ
Which type is easiest for beginners?
Most people find a digital model easiest, because the number appears directly and the tare button handles trays.
Does the type change accuracy?
Each type can be accurate or off depending on build, care and use. Follow the maker’s guide for limits and check against a known weight.
The Short Version
Digital scales suit daily use, spring and beam scales work without power, and hanging scales handle awkward shapes. Choose by space, power and the parcels you send.
