Digital calipers
A caliper showing 0.01 mm is stating its resolution — the step of the display. How far the reading may be from the truth is a separate figure, usually ± 0.02 mm (0.001 in), and it is the one that decides whether the tool is a measuring instrument. Two of the five calipers we compare publish it.
Three calipers, ordered by how well they specify themselves.
The MIB states ± 0.02 mm (0.001 in) to DIN 862 and gives its resolution separately at 0.01 mm. Naming a standard means the figure has a defined meaning — over what range, at what temperature, established how. For a measurement that ends up in a report or a dispute, that is the whole difference.
The HARDELL states ± 0.02 mm (0.001 in) over 0–150 mm (0 to 5.91 in) as its own claim, with hardened stainless jaws, four measuring modes, and an explicit sentence saying it is splash-proof and dust-proof but not waterproof. At a third of the MIB’s price, that is a properly specified instrument.
The ORTHLAND uses a glass grating scale rather than a capacitive strip, stated to resist the humidity and magnetism that make cheap calipers drift and jump. IP54, an over-speed chip, a thickened stainless body. It publishes no accuracy figure at all, which on a tool sold for measurement integrity is a real gap.
Zero it, measure a known dimension — a gauge block, a drill shank, another caliper’s own beam — and see what it says. That is not a calibration, and it is the only check available when the maker declines to state one.
Where repeatability is everything and absolute accuracy is almost irrelevant.
Where accuracy starts to matter, and where the instrument's stated tolerance becomes a real number.
The depth rod and the step jaws, which are the caliper's underused features.
Most domestic use, where any reasonable caliper is far beyond what the job needs.
| Your need | What matters | What does not |
|---|---|---|
| Comparing parts | Repeatability | Absolute accuracy |
| Working to a drawing | Stated tolerance | Extra display digits |
| General workshop use | Clean jaws | The last decimal place |
| A certified figure | Calibration by a service | Anything on the box |
A caliper is ruined by grit and by being thrown into a drawer. Swarf between the jaws throws the zero, a bent beam ends the instrument, and a battery left in a digital caliper leaks and corrodes the contacts.
Minor risks, but real ones in a workshop.
± 0.02 mm (0.001 in) to DIN 862 · 0.01 mm resolution · four functions
The only caliper in this hub that names the standard behind its figure: ± 0.02 mm (0.001 in) to DIN 862, with 0.01 mm resolution and the four standard measuring functions.
Best for: Work where the measurement has to be defensible, and naming the standard is part of that.
150 mm (5.91 in) · ± 0.02 mm (0.001 in) stated · hardened stainless · four modes
A hardened stainless caliper stating ± 0.02 mm (0.001 in) over 0–150 mm (0 to 5.91 in), splash and dust protected, with the four standard measuring modes and a zero button.
Best for: The value pick: a published tolerance and hardened jaws, without paying for a named standard.
150 mm (5.91 in) · glass grating scale · IP54 · hardened stainless body
A caliper using a glass grating scale rather than the usual capacitive strip, which the maker states resists humidity and magnetism, in an IP54 hardened stainless body.
Best for: A workshop where oil, swarf and damp are normal and a capacitive caliper keeps misbehaving.
No — it is behaving exactly as specified. A display stepping in hundredths with a stated accuracy of ± 0.02 mm (0.001 in) can legitimately be two hundredths out. The two numbers describe different things.
The German standard covering calipers, including permissible errors. A tolerance quoted against it has a defined meaning; a tolerance quoted alone is a number the maker chose. One caliper in this hub names it.
Close the jaws fully and zero the display before every set of measurements. A caliper that has been in a drawer reads a few hundredths off, and the zero costs nothing to reset.
Resolution is the smallest increment the display shows; accuracy is how close the reading is to the true value. A display can show more digits than the instrument can justify.
For comparing parts, repeatability. For working to a drawing, accuracy against a stated tolerance. Most domestic work only needs the first.
Usually measuring pressure, grit in the jaws, or a zero that has drifted. All three are technique and maintenance rather than instrument faults.
Digital is fastest and needs a battery; dial shows movement clearly without one; vernier needs no power and takes practice to read quickly.
Only if you must certify a figure to someone else. For your own work, checking the zero and comparing against a known gauge is enough.
For most workshop use, yes. For fine tolerances a micrometer is the appropriate instrument, and a caliper is not intended to compete with it.
Suited to: Work where the measurement has to be defensible, and naming the standard is part of that.
Best figure: States ± 0.02 mm (0.001 in) to DIN 862 — a named standard, not a house claim
Worst figure: The most expensive caliper here, at more than double the HARDELL for the same stated tolerance
Suited to: The value pick: a published tolerance and hardened jaws, without paying for a named standard.
Best figure: Publishes an accuracy figure — ± 0.02 mm (0.001 in), stated by the maker — at a third of the price of the MIB
Worst figure: No standard named for the accuracy figure, unlike the MIB caliper's DIN 862
Suited to: A workshop where oil, swarf and damp are normal and a capacitive caliper keeps misbehaving.
Best figure: A glass grating scale, stated to resist the humidity and magnetism that upset capacitive calipers
Worst figure: No accuracy figure published anywhere in the listing
Targets, tripods and spares from the same aisle, at the price we noted. Check the thread matches the instrument you pick before ordering: it depends on the mount and the part number, which the listing states.
Instrument against instrument, where we have already published the comparison.
The instruments above come from the catalog of this site. Specifications are the ones the manufacturer states and the ones on the Amazon listing; prices are the Keepa reading for the date below, and both change. Ranking uses declared specifications, stated strengths weighed against stated limits, and price. Nothing here has had its accuracy checked by us, and the page says as much.
Last checked on
Prices quoted in these summaries are dated readings. The live price is shown next to each product.
Thermal cameras, line lasers and clamp meters swing by thirty dollars or more across the year, and the biggest "discounts" often land at prices the same model sold for six weeks earlier. UniverTrack tracks the real price history across retailers, spots fake reductions, and alerts you when it is genuinely the moment to buy.
