Best Digital Bore Gauge Under $100 (2026): 4 Compared

An engine rebuild starts with knowing whether the bores are still round, and a bore gauge is the tool that answers that question before new pistons and rings go in. The short answer on best digital bore gauge under 100: the Neoteck set leads with a 1.4 to 6 inch range, 15 anvils and a 0.0005 inch resolution, while the ALLmeter matches the range and the anvil count with a large LCD. We compared 4 digital bore gauge sets on what each listing states: range, resolution, anvils, depth, indicator and box contents.

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Picks for the garage

#	Product	Shop Score	Buy
1	Neoteck 1.4-6"/0.0005" Digital Indicator Bore	9.7/10	Buy on Amazon
2	ALLmeter Digital Dial Bore Gauge Set	9.6/10	Buy on Amazon
3	HDLNKAK Digital Dial Indicator Bore Gauges Set	9.6/10	Buy on Amazon
4	AUTOUTLET Digital Dial Bore Gauge Set 50–160mm	9.5/10	Buy on Amazon

1

Neoteck 1.4-6"/0.0005" Digital Indicator Bore

Neoteck·9.7/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A digital bore gauge set with a 1.4 to 6 inch range, 0.0005 inch resolution, 15 anvils and a 6 inch measuring depth for engine cylinder measurement.

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Pros

• 1.4 to 6 inch range with a 6 inch measuring depth
• 0.0005 inch resolution with an error of 0.001 inch stated
• 15 anvils from 1.4 to 4 inches with 2 wheel guides and 3 washers
• Chrome-plated handle with an ABS storage box and 1 LR44 battery included

Cons

• Anvil list repeats 2 inches
• No carbide tip is stated on the anvils
• No warranty term is stated
• No safety listing is stated

2

ALLmeter Digital Dial Bore Gauge Set

ALLmeter·9.6/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A digital bore gauge set with a 1.4 to 6 inch range, 0.0005 inch accuracy and 15 anvils, with a large LCD and inch and millimeter switching.

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Pros

• 1.4 to 6 inch range with 15 anvils
• Large LCD with instant readings and inch and millimeter switching
• Self-centering two-point contact for taper, ovality and diameter variation
• ABS storage case with digital indicator, measuring rod, wheel guides and spacers

Cons

• No measuring depth figure is stated
• No error figure is stated
• No warranty term is stated
• No safety listing is stated

3

HDLNKAK Digital Dial Indicator Bore Gauges Set

HDLNKAK·9.6/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A digital bore gauge set with a 2 to 6 inch range, carbide anvils, self-centering and an LCD display, with 12 anvils and a blue ABS case.

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Pros

• Carbide anvils with a carbide tip on the measuring plunger
• Self-centering with two-point contact for ovality and taper
• 12 anvils from 2 to 4 inches with 4 adjusting washers
• Chrome plated handle with an ABS storage case and instruction manual

Cons

• Accuracy stated as 0.0003 inch in one bullet and 0.0005 inch in another
• Depth stated as 10 inches in one bullet and 150 mm (5.9 inches) in another
• Range starts at 2 inches, above the 1.4 inch low end of the Neoteck and ALLmeter
• No warranty term is stated

4

AUTOUTLET Digital Dial Bore Gauge Set 50–160mm

AUTOUTLET·9.5/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A bore gauge set with a 2 to 6 inch range, 0.01 mm resolution and 12 anvils, described as a mechanical dial gauge in the bullets despite a Digital title.

Check price on Amazon

Pros

• 2 to 6 inch range with a measuring depth up to 150 mm (6 in)
• 0.01 mm (0.0005 in) resolution for precision work
• 12 interchangeable anvils for internal bore measuring
• ABS storage case with replaceable inserts

Cons

• Anvils listed as 50 to 105 mm while the range runs 50 to 160 mm
• No warranty term is stated
• No safety listing is stated

Compared on paper

Specs are the manufacturer’s ratings as listed, collected 8 November 2026. “Not stated” means the listing does not give the figure.

How the points were given

Each gauge is scored on performance, build, value, safety and warranty. How we pick explains the weights. No listing states a safety listing or a warranty term, so safety and warranty stay empty across the group.

Shop Scores range from a low of 9.2 to a high of 9.8, with each tool positioned by its weighted points proportionally, and more points always yields a higher score. Safety is scored for corded, cordless and air tools and for listings that state safety features; hand tools without either are scored on 90 points.

What the listings tell you

Every listing states a measuring range and a resolution figure. 2 list a 1.4 to 6 inch range and 2 list a 2 to 6 inch range. 2 list 15 anvils and 2 list 12 anvils. All 4 state a 0.0005 inch resolution, and 2 state a 6 inch measuring depth. No listing states a warranty term or a safety listing, and 1 listing contradicts itself on accuracy and depth.

How to choose the best digital bore gauge under 100

Range: match the bore

Start with the smallest bore you will measure. The Neoteck and ALLmeter sets start at 1.4 inches, while the HDLNKAK and AUTOUTLET sets start at 2 inches. For motorcycle engines and smaller bores, the 1.4 inch low end matters; the ALLmeter listing names motorcycle engines among its uses. All 4 cover bores up to 6 inches.

Resolution and stated error

All 4 list a 0.0005 inch resolution. The Neoteck also states an error of 0.001 inch, the only error figure in the group. The HDLNKAK listing states an accuracy of 0.0003 inch in one bullet and a resolution of 0.0005 inch in another, so use the 0.0005 inch figure when comparing. For engine work, see the best bore gauge for engine building guide.

Anvils and depth

Count the anvils and the depth. The Neoteck and ALLmeter sets include 15 anvils, and the HDLNKAK and AUTOUTLET sets include 12. The Neoteck and AUTOUTLET listings state a 6 inch measuring depth, while the HDLNKAK listing states both 10 inches and 150 mm (5.9 inches). The ALLmeter listing states no depth figure, so check the bore depth before ordering.

Digital or dial

3 of the 4 sets are digital, with an LCD or digital indicator. The AUTOUTLET title says Digital, but its bullets describe a clear dial gauge with a mechanical dial structure, so read the bullets as the listing’s own description. If you want a dial gauge, see the best bore gauge with dial guide.

Garage Fit Check

• Check the anvil count on arrival: 15 in the Neoteck and ALLmeter sets, 12 in the HDLNKAK and AUTOUTLET sets.
• Set the digital indicator to 0 before measuring, as the Neoteck listing directs, and pick the anvil for the bore size.
• The Neoteck set includes 1 LR44 battery; check the battery before measuring.
• All 4 sets come with an ABS storage box or case, so the anvils and rods stay organized.
• Check the measuring depth against the bore: 6 inches on the Neoteck and AUTOUTLET listings.

FAQ: garage tools

What range do I need for engine cylinders?

It depends on the smallest bore. The Neoteck and ALLmeter sets cover 1.4 to 6 inches, and the HDLNKAK and AUTOUTLET sets cover 2 to 6 inches. For smaller bores such as motorcycle engines, pick the 1.4 inch low end.

What is the difference between resolution and error on these gauges?

Resolution is the smallest step the display shows, and error is how far a reading can stray. All 4 list a 0.0005 inch resolution, and only the Neoteck states an error figure, at 0.001 inch. The HDLNKAK listing states an accuracy of 0.0003 inch in one bullet and a resolution of 0.0005 inch in another.

Are these gauges digital or dial?

3 are digital and 1 is described as a dial gauge. The Neoteck, HDLNKAK and ALLmeter sets list a digital indicator or LCD display. The AUTOUTLET title says Digital, but its bullets describe a clear dial gauge with a mechanical dial structure.

How deep can these gauges measure?

The Neoteck lists a 6 inch measuring depth, and the AUTOUTLET lists a depth up to 150 mm (6 in). The HDLNKAK lists both 10 inches and 150 mm (5.9 inches), so its depth figure is unclear. The ALLmeter lists no depth figure.

Do any of these bore gauges state a warranty?

No. No listing in this group states a warranty term, and no listing states a safety listing, so warranty and safety add nothing to any gauge’s score here.

Related: the best bore gauge for engine building, the best bore plug gauge, the best digital micrometer with case, the micrometer vs caliper guide, and the Engine and Shop Equipment hub.