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Which Digital Caliper Is Most Accurate? I Tested 4 Popular Options
Which Digital Caliper Is Most Accurate? I Tested 4 Popular Options
Writtten and Edited by: Benjamin White
March 16, 2025
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If you’re a DIYer, woodworker, machinist, or engineer, a good pair of calipers is a must-have in the shop. They allow you to get precise measurements that a ruler or tape measure just can’t provide.
But with so many options hitting the market, which one should you actually buy?
To find out, I tested four different calipers:
- Mitutoyo Vernier Caliper
- Jiavarry Digital Caliper
- Hardell Digital Caliper
- Starrett Electric Slide Caliper
I ran them through several tests including:
- Smoothness
- Outside measurements
- Internal measurements
- Depth measurements
If you’d like to see the video of me testing these calipers, watch here:
The Calipers Tested
First up is the Mitutoyo Vernier Caliper, coming in at $147.64 on Amazon at the time of filming.
This caliper features hardened stainless steel construction with a satin chrome finish for durability and corrosion resistance.
You get four measurement types:
- Outside measurements
- Inside measurements
- Depth measurements
- Step measurements
It uses a dual vernier scale, with the top scale reading inches and the bottom reading millimeters.
For this test, the Mitutoyo served as the reference measurement.
Next up is the Hardell Digital Caliper, priced at $33.99 on Amazon.
It features a large LCD display that’s easy to read in different lighting conditions.
One unique feature is that this caliper is rechargeable. Instead of swapping batteries, you can simply plug it in using the charging cable included in the case.
It also includes an automatic shutoff after five minutes to conserve power.
Last in the lineup is the Starrett Electric Slide Caliper, priced at $137 on Amazon.
This caliper is made from hardened stainless steel and is built with durability in mind.
Features include:
- Ergonomic thumb wheel for smooth adjustments
- Digital display
- Precision reading down to 0.0005 inches or 0.01mm
This is clearly positioned as a premium digital caliper.
Smoothness Test
Before testing accuracy, I wanted to see how smooth each caliper felt during operation.
To measure this, I used a scale to determine how much force it takes to close the jaws.
| Caliper | Force Range |
|---|---|
| Mitutoyo | 540g – 626g |
| Jiavarry | 330g – 350g |
| Hardell | 280g – 322g |
| Starrett | 290g – 320g |
The Starrett came out the smoothest overall, with the Hardell close behind.
The Mitutoyo required the most force, but it’s also the heaviest caliper in this test, so that result is expected.
Accuracy Test – Outside Measurements
To test accuracy, I used a precision 1-2-3 block, measuring each side using the outside jaws.
The Mitutoyo was used as the baseline reference measurement.
Outside Accuracy Results
| Rank | 3 Inch Measurement | 3 Inch Measurement | 1 Inch Measurement |
|---|---|---|---|
| 1 | Starrett — 3.002 | Starrett — 2.001 | Starrett — 1.000 |
| 2 | Jiavarry — 3.006/td> | Jiavarry — 2.035 | Jiavarry — 1.002 |
| 3 | Hardell — 3.050 | Hardell — 2.050 | Hardell — 1.055 |
Across all three sides of the block, the Starrett consistently produced the most accurate measurements.
The Jiavarry came in second, while the Hardell lagged behind slightly in each test.
Accuracy Test – Internal Measurements
Calipers can also measure internal dimensions using the inside jaws.
For this test, I measured the inside diameter of circular openings.
The Mitutoyo again served as the reference measurement, which read 10mm.
Internal Measurement Results
| Rank | Caliper | Measurement |
|---|---|---|
| 1 | Starrett | 10.08mm |
| 2 | Hardell | 10.10mm |
| 3 | Jiavarry | 10.30mm |
Once again, the Starrett produced the closest measurement, followed by the Hardell, with the Jiavarry slightly further off.
Depth Measurement Test
Calipers can also measure depth using the depth rod on the back of the tool.
I tested both 3-inch depth and 1-inch depth using the 1-2-3 block.
Depth Test Results
| Rank | 3 Inch Depth | 1 Inch Depth |
|---|---|---|
| 1 | Starrett — 3.000 | Hardell — 1.004 |
| 2 | Hardell — 3.010 | Starrett — 1.004 |
| 3 | Jiavarry — 3.055 | Jiavarry — 1.0135 |
The Starrett once again produced the most accurate measurement for the 3-inch depth.
For the 1-inch depth, the Hardell and Starrett tied for the closest measurement.
Final Results – Which Caliper Is Best?
So which caliper came out on top?
Honestly, you can’t go wrong with a traditional vernier caliper. The Mitutoyo delivered extremely consistent and accurate measurements throughout the testing, with only a slight variation in the 3-inch depth test.
But when it comes to the digital calipers, the Starrett was clearly the most accurate overall.
It produced the closest measurements across nearly every test, and in some cases landed exactly on the expected value.
The downside is the price, since it’s one of the more expensive options.
However, if precision matters most, the Starrett takes the win.
That said, if you’re working on a tighter budget, the Jiavarry performed surprisingly well, delivering accurate measurements at a fraction of the cost.
Frequently Asked Questions
What is a 1-2-3 block and why is it used for measuring?
A 1-2-3 block is a precision metal block that measures 1 inch by 2 inches by 3 inches. It’s commonly used in machining and tool testing because each side is manufactured to very tight tolerances. That makes it a reliable reference when checking the accuracy of measuring tools like calipers.
What should you look for when buying a digital caliper?
When choosing a digital caliper, you should consider a few key factors:
- Accuracy and repeatability
- Build quality
- Display readability
- Battery life
- Measurement range
For professionals who need high precision, brands like Starrett and Mitutoyo are often trusted in machining and engineering. For DIY projects, more affordable options can still perform well depending on the application.
Why do some digital calipers give slightly different readings?
It’s normal for digital calipers to show small differences in measurements. Several factors can affect this, including:
- Calibration of the tool
- Dirt or debris on the jaws
- Battery level in digital models
- Manufacturing tolerances of the caliper itself
- Slight changes in how the tool is held during measurement
That’s why professional machinists often take multiple readings to confirm accuracy.
