Neiko 01407A caliper Review

The Neiko 01407A makes sense as an inexpensive caliper for occasional measurements on a dry workbench. It covers the usual outside, inside and depth checks, and its digital display saves you from reading a fine scale or converting units yourself. Reported reference checks are encouraging, but they don’t establish the accuracy of every measurement this tool can take.

I’d consider it for sizing hardware and checking hobby parts. I’d be more cautious if a small measurement error could spoil expensive work. Its biggest practical question is how easily you can position the jaws: some tested samples moved smoothly, while an older one felt gritty.

What the 01407A can measure

The 01407A is the stainless-steel model sold as a 6-inch/150-mm caliper. Neiko’s branded user guide distinguishes it from the 8-inch 01408A and 12-inch 01409A. If a listing offers several sizes, make sure its specifications and comments refer to the one you’re buying.

The large jaws close around a part to measure its thickness or outside diameter. The smaller jaws open against the walls of a hole or slot. A thin rod extends from the end for depth measurements. That makes it useful for checking a spacer’s thickness, a hole’s width or a recess’s depth, provided the measuring surfaces can reach the feature.

The controls include power, zero and a button for millimeters, decimal inches and inch fractions. Fraction mode is documented for this model, with 1/128-inch increments. It’s handy when you work with fractional dimensions, but decimals give you finer displayed steps. Changing units doesn’t improve the underlying measurement.

You can also zero the display at an open position to compare another part against that opening. Reset zero with the jaws closed before returning to ordinary measurements. If computer logging matters, choose another tool with documented connection support; the 01407A’s reported port doesn’t establish a compatible cable, protocol or software setup.

How much confidence to put in the 01407A’s readings

The display advances in 0.0005-inch or 0.01-mm steps. That’s resolution: the smallest change it can show. Accuracy describes how far the result may be from the actual dimension. A screen showing more decimal places doesn’t guarantee that those places are correct.

The commonly advertised accuracy figures are ±0.001 inch and ±0.02 mm. Treat them as separately stated specifications, not exact conversions: 0.001 inch equals 0.0254 mm. The occasional claim of 0.002-mm accuracy isn’t supported by the Neiko-branded guide and conflicts with the other published figures. Don’t use it to justify a purchase.

In an April 2014 hands-on report, one 01407A read 1.000 and 2.000 inches against nominal 1- and 2-inch machinist gauges. It also returned to zero after rapid opening and closing. Those are useful results for that sample, but two outside checks don’t validate the full range, inside jaws or depth rod. The report gives no repeated-reading table or reference calibration records.

A separate review, originally dated April 2022 and updated in March 2026, reports gauge-block checks across the range within the claimed accuracy. Gauge blocks are reference pieces made to known dimensions. This broadens the outside-measurement evidence, but the account doesn’t publish individual errors, repetition counts or reference certificates. Its update date also doesn’t establish that a newly manufactured sample was tested.

Another hands-on account reports inaccurate internal measurements associated with a jaw gap, without quantifying the error or providing enough checking detail to establish its cause. That leaves inside performance uncertain; it doesn’t cancel the outside results or prove every 01407A has faulty jaws. Quantified depth results remain missing too.

For your own checks, clean the measuring faces, close the jaws gently and check zero. Use light, consistent pressure and repeat the measurement after releasing and repositioning the jaws. A known reference near the size you’re measuring is more useful than repeatedly confirming zero alone. Check the measurement mode you actually need; an outside reference cannot qualify the inside jaws.

If your part allows only ±0.001 inch of variation, a caliper advertised at ±0.001 inch leaves too little room to confidently decide whether a borderline part passes. For that job, choose a suitably more accurate instrument and have its accuracy checked.

How the 01407A handles at the bench

The thumbwheel helps you move the sliding jaw in small amounts, while the locking screw holds the opening. They do different jobs: the wheel positions the jaw; the screw keeps it there. Release the lock before sliding, and avoid squeezing a part harder just to make the display settle.

Handling reports disagree. The 2014 sample’s gritty travel made it awkward to set a specific opening. A separate comparison test found the thumbwheel easy to operate while switching among outside, inside and depth measurements, and described smooth movement. There’s no established revision history explaining that difference. You shouldn’t assume either report describes every unit now on sale.

That matters more when you use the caliper frequently. If you’re repeatedly nudging the jaws onto small parts, sticky movement can slow you down and make consistent contact pressure harder. For an occasional bracket or spacer check, a little extra care may be an acceptable compromise. A slider that binds or won’t let you repeat a measurement is a reason to return the tool.

The display also deserves a look before you commit. Testers found the main readout and contrasting beam scale easy to see, but noted smaller decimal digits. A large screen isn’t the same as uniformly large numbers. If small print is difficult for you, inspect the decimal display in product photos rather than relying on the “large LCD” description.

Keeping the 01407A ready to use

The Neiko-branded guide specifies an SR44 or LR44 button cell. Its battery cover slides off, and the guide identifies a dim or flashing display as a low-battery symptom. Check the installed battery’s marking before buying replacements, particularly with an older unit.

A reviewer reported that the supplied battery arrived dead and the spare got the tool working. That’s a useful reminder to keep a replacement nearby, not evidence of a model-wide failure rate. Battery endurance and standby drain remain unmeasured in the available exact-model tests. Don’t count on a full year from one battery.

Retail descriptions list automatic shutoff, but a verified shutoff interval and consistent movement-triggered power behavior aren’t established. Check how your unit behaves before leaving it stored for weeks.

Case quality is another sample-dependent detail. The 2014 report described a loose fit in a basic plastic case; the later gauge-block review described a padded case more favorably. Check that yours holds the tool securely before carrying it around.

Treat the 01407A as a dry-bench tool. The guide says to keep liquids away and clean the face with a dry, lint-free cloth, avoiding alcohol and acetone. Stainless steel doesn’t establish protection for the electronics. A manufacturer-backed dust or water rating isn’t confirmed for this model.

Neiko provides customer support, but a fixed warranty term for the 01407A isn’t clearly stated. Check the seller’s return terms and any written warranty before buying; don’t assume a retailer’s guarantee is Neiko’s warranty.

Does the 01407A make sense for your work?

Buy the 01407A if you need an affordable way to check ordinary hobby parts, its capacity covers your work, and you can check its readings before relying on them. US sellers still list the exact model. Confirm the 6-inch selection and seller, since Neiko listings can group several sizes together.

For frequent use, the more expensive Mitutoyo 500-196-30 is a useful alternative to consider. It covers the same nominal range and has the same displayed increments, so you’re not paying for extra decimal places. Its manufacturer documents the specifications and provides model-specific maintenance, parts and repair guidance. That support is a concrete reason to spend more when a measuring tool is part of your daily routine.

Some owners favor Mitutoyo, but those preferences don’t prove a particular Neiko will measure badly. Nor do conflicting accounts of marketplace purchases establish whether a seller’s stock is genuine. If you choose the Mitutoyo, its manufacturer’s distributor locator can help you find a seller.

If your parts exceed 6 inches, choose a larger caliper. If you’re working around coolant or splashes, choose a model with documented protection. For tighter outside measurements, consider a micrometer with suitable accuracy and capacity; a pricier caliper alone may not solve that problem.

The Neiko is worth considering when low cost and occasional convenience matter most. Keep it only if its movement, readability and checked measurements suit your work. Spend more when you need documented support, environmental protection or measurement confidence that this model’s evidence can’t establish.