Note: EkoDeluxe now specialises in handheld test and measuring instruments. Looking for tools related to this topic? See our Construction & Inspection Tools.
Short answer: choose a scale by maximum capacity, readability (the smallest increment it displays), the way the load is applied (hanging, platform or pan) and the environment; if weights are used to set prices or charges, it must be an approved instrument for trade use.
How does a digital scale measure weight?
Most industrial scales use load cells. A load cell is a metal element fitted with strain gauges; when the element flexes slightly under load, the gauges change resistance in proportion to the force. Electronics convert that small signal into a weight.
Laboratory balances with fine readability often use electromagnetic force restoration instead: a coil generates exactly the force needed to balance the load, and the current required indicates its mass. This gives very fine resolution but is sensitive to vibration, draughts and temperature.
A crane scale hangs between a hook and the load, measuring tension. A platform scale has one or more load cells under a flat deck.
Which type is right for me?
| Type | Capacity range | Best for | Limitation |
|---|---|---|---|
| Hanging / crane scale | From tens of kilograms to several tonnes | Lifting operations, bulk bags, livestock in slings | Must be used within lifting safety rules |
| Platform scale | Up to hundreds of kilograms or more | Parcels, sacks, drums, livestock crates | Takes floor space |
| Bench scale | Up to tens of kilograms | Counting parts, packing | Lower capacity |
| Livestock scale | Animal weighing with averaging | Sheep, pigs, calves | Needs a crate or platform |
| Precision / analytical balance | Grams to hundreds of grams | Labs, formulation, jewellery | Needs a stable location away from draughts |
What specifications should I compare?
Capacity and readability. Choose capacity above your heaviest load with margin, but remember that readability usually becomes coarser as capacity increases.
Accuracy class and verification. Instruments approved for trade use carry specific markings and are verified for accuracy. Non-approved scales may be fine for internal use but not for selling by weight.
Averaging or animal mode. Livestock and swinging loads need a function that averages readings over time.
Ingress protection. Wash-down areas and outdoor yards need a suitable IP rating under IEC 60529.
Power and display. Long battery life, a remote display and backlighting help in sheds and warehouses.
Lifting rating. For crane scales, the shackle and hook must be rated for the load, and the scale used within lifting procedures.
How are scales used in the UK?
Weighing equipment used for trade — for example selling goods by weight or charging based on weight — falls under weights and measures law. The Non-automatic Weighing Instruments Regulations 2016 cover the conformity of such instruments placed on the market. If you sell by weight, check with your local Trading Standards service and use an approved, marked scale.
Common uses include farm weighing of feed and livestock, warehouse and parcel weighing, scrap and recycling, laboratory work, and checking loads before lifting. Weighing also supports manual handling assessments under the Manual Handling Operations Regulations 1992, because knowing the load is the start of reducing risk.
What mistakes should I avoid?
- Overloading a scale beyond its capacity, which can permanently damage load cells.
- Using a non-approved scale to sell by weight.
- Placing a balance near draughts, vibration or sunlight.
- Not zeroing or taring before each weighing.
- Side-loading a crane scale or using an unrated shackle.
- Ignoring the warm-up time that precision balances need.
How do I set up and look after a scale?
Install platform and bench scales on a firm, level surface and adjust the feet until the level bubble is centred. A scale standing on an uneven floor shares the load unevenly between load cells and can read inconsistently. Keep the space under a platform clear of debris, which can bridge the deck to the floor and absorb part of the load.
Switch scales on and allow them to stabilise before use. Zero the display with nothing on it and tare containers before adding product. Place loads centrally where possible, and avoid dropping heavy items onto the deck, because shock loads can damage load cells even below the rated capacity.
For precision balances, use the draught shield, keep the pan clean, and handle weights with tweezers or gloves. Check any scale periodically against known test weights and keep a record, so you notice drift before it affects your results.
Frequently asked questions
What is the difference between capacity and readability?
Capacity is the maximum load. Readability is the smallest increment shown. A 300 kg scale will not usually read in single grams.
Do I need a trade-approved scale?
If you sell goods or charge by weight, yes. For internal checks and stock control, a non-approved scale can be suitable.
How do I check that my scale is accurate?
Use calibrated test weights at several points across the range, and have the scale calibrated by a competent provider if results matter.
Can a crane scale be used for lifting operations?
It forms part of the lifted load, so it must be suitable for the load and used under your normal lifting arrangements and checks.
Why does my lab balance reading drift?
Common causes are draughts, temperature changes, static on the sample, vibration or insufficient warm-up.
What should I check before ordering?
Before you order any scale, write down the measurements or tasks it must handle, the range and accuracy you need, where it will be used and who will use it. Compare those notes with each product's specification sheet rather than its headline features, and keep the manual and any certificates with the instrument once it arrives.
Shop weighing scales
See crane scales, platform scales and lab balances in our Weighing Scales collection.
Sources
Photo in article: Ildar Sagdejev (Specious), CC BY-SA 4.0 via Wikimedia Commons
