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Mitutoyo Coolant Proof Digital Caliper-The Feature We Always Wanted

The Mitutoyo coolant proof digital caliper is one of the few digital calipers capable of working perfectly under harsh conditions.

The Mitutoyo digital calipers are IP67 certified, which means they are dust and water-resistant up to 1m in depth.

In general, digital calipers are tools that can take measurements with an accuracy of 0.02mm on a 150mm or 300mm length. However, high-end digital calipers, such as the Mitutoyo digital calipers, have an accuracy of up to 0.01mm over a standard 150mm length.

In a moment, we’ll go over the features of the Mitutoyo digital calipers.

Overview of Mitutoyo digital calipers


Mitutoyo digital calipers are made of stainless steel, with some models having a carbide finish on the jaws.

The calipers have a rectangular display that displays measurements to 0.01mm accuracy. The display is slid back and forth along the length of the calipers by a thumb roller attached to the display.

Some models include a data hold unit as an optional accessory used to store values to be processed in the future for a set period.

Also available as optional accessories are connecting cable, USB direct input tool, and a U-WAVE-T dedicated connecting cable.

The caliper is powered by an SR44 battery housed in a screwless casing for ease of replacement.

Overall, the caliper has a sleek design with a premium finish that can withstand harsh work environments.


Ip67 protection

Most digital calipers have an IP65 protection code, which protects them from low-pressure water jets and water spray.

The Mitutoyo digital calipers come with an advanced IP67 rated enclosure that protects the instrument from being submerged in water up to a depth of 1m.

The IP 67 protection code also provides dust protection and trouble-free operation even when exposed to coolant or cutting oil.

To ensure that the protection is secure, the company performs a 100 percent air leak test before shipping the product.

Enlarged display

Previous Mitutoyo digital calipers had a 7.4mm character height on the LCD.

With the current upgrade in security features, the company decided to increase the character display height of the newer models to 9mm, which improves ease of use, particularly for DIYers with vision problems.

Auto power ON /OFF

The digital calipers have auto-on and off features, similar to what is seen in today’s smartphone displays.

When the calipers are not used for 20 minutes, the auto-off feature turns off the LCD.

The caliper also saves the current point of the measuring system as the origin point, making it easier to use when the user returns to work.

Sliding the caliper scale returns power to the LCD immediately, allowing the user to resume where he left off.

Keep in mind that the caliper’s built-in ABS (absolute) scale measurement eliminates the need to re-set the origin each time it is turned on.

4-way operations

The digital calipers have four measurement modes. The calipers can measure the inside, outside, step, and depth of the material or object they come into contact with.

Improved battery life

The new SR44 battery included in the digital caliper pack has an additional useful life of two years.

The previous models’ batteries lasted about three years before they were completely depleted.

The newer model includes low current consumption technology, which has increased battery life by two years, giving it a total lifespan of five years before it needs to be replaced.

Additional accessories

Depending on the intended use, various additional accessories are attached to different models of calipers.

Unless otherwise specified by the buyer, models used for hand measurements do not require any additional accessories.

Models with an external data port are incorporated in process control plants where automation is required for every bit of the system to function properly.

A connecting cable that can be connected directly to Pc is also included in some models at the request of the end-user.

The incorporation of U-WAVE technology in some models also enables wireless connection and data transfer directly to a PC.

Low battery alarm

A low battery alarm in the calipers indicates that the battery needs to be replaced. The alarm function is indicated by a B symbol in the display.

This alarm function allows the user to plan for a timely battery replacement before the caliper becomes unusable or trips out in the middle of a measurement operation.

Incremental measurement function

This enables the measurement to be incremented gradually by allowing the user to temporarily set the display value to zero at the current slider position.

This feature is especially useful to mechanics incorporating measurement increments in the design.

Hold function

Sometimes we might forget to record a reading after taking a measurement. This practice is usually common in design engineers and mechanics.

Some models of the Mitutoyo calipers are equipped with a holding function controlled by a knob featured at the top of the caliper.

This knob allows you to hold a displayed value for a set amount of time before taking additional measurements.

The hold function has a limitation which is the fact that it cannot operate simultaneously with the external output function.


  • IP67 protection
  • Extended battery life
  • ABS measurement
  • Precision measurements
  • Multiple measurement operations


  • Expensive price tag
  • Only decimal readings

What to look for before buying

A digital caliper is an important tool to have in your toolbox, whether you are a mechanic or a DIYer there are a few things to consider before purchasing a digital caliper from the market. The following is a list of things to look for before purchasing a digital caliper.


The degree of error allowed in measured readings is defined as the accuracy of a digital caliper.

Digital calipers have an accuracy of 0.02mm on a standard 150mm length, while others have an accuracy of 0.04mm on a 300mm length.

However, 0.01mm accuracy is not uncommon among high-end calipers with very high precision.

Various measurement jobs require different levels of accuracy. DIYers working on home improvement jobs can afford to work with calipers of 0.04mm or 0.02mm accuracy.

However, design engineers and process plants where precision is critical would require high-end calipers with 0.01mm accuracy.


The ability of a caliper to reproduce the same value over a series of measurements is referred to as its precision.

Some calipers would provide multiple readings for several measurements taken on the same object or material. This warrants the user to determine and work with the average of the measured values.

On the other hand, a precise caliper can repeatedly replicate the same measured value over a series of measurements. This increases confidence in the measured value and is a benefit to design engineers.

Depth gauge

A depth gauge is a tool used to determine the depth of an object. The measurement is taken from an object’s surface of reference to the desired termination point.

Most digital calipers include a depth gauge, but it’s a good idea to double-check its availability before purchasing one.

Inside/ outside jaws

The inside and outside jaws of a digital caliper are used to measure an object’s internal and external diameters.

Some calipers have carbide-coated jaws, while others have exposed jaws. The carbide finish is especially important when working with rough metals or objects, and it helps extend the useful life of the calipers.

Water protection

The water protection feature has become the selling point of most manufacturers.

While there are various water protection ratings out there, the most common ones are the IP54 and Ip65 protection, which offers protection from condensation, low-pressure water jets, and sprinkles.

This level of protection is okay for DIYers working on simple home projects. However, professionals are advised to opt for an instrument with an IP67 rating capable of protecting the equipment even if it is submerged in water up to a depth of 1m.


The durability of a digital caliper is the number of good years that the user can get out of it if it is used properly.

The material of construction and design largely influences durability. In general, digital calipers are made of either plastic, stainless steel, or carbon fiber.

While plastic offers the lightest weight equipment, it is also the less durable option.

On the other hand, carbon fiber also offers a lightweight instrument. Still, it is more durable than the plastic material due to the tightly woven carbon fiber strands, which provide extra strength.

Stainless steel is the most durable option; it provides ruggedness and durability at the expense of extra weight and is typically found on high-end calipers.


The calibration of an instrument ensures that the results produced are accurate. Most digital calipers are already calibrated before they are shipped to the end-users.

However, if you get inaccurate results, there should be an instruction manual with a step-by-step guide on recalibrating your equipment.


All instruments require maintenance regularly to ensure that it operates properly at all times.

Maintenance also helps to extend the useful life of the equipment.

A common maintenance practice would be to clean the caliper thoroughly after use and to avoid prolonged contamination with dirt, water, and fluids.

Ease of use

The ease of use refers to how easily an armature or newbie can navigate the instrument.

Thanks to the manufacturers, most calipers come with a detailed instruction manual with a step-by-step guide on getting started with the equipment.


FAQs about Mitutoyo coolant proof digital caliper review

What are the uses of Digital Caliper?

Digital calipers can be used for a variety of measurements. I can tell you off the top of my head that they are used for making precise measurements that a ruler would fall short of.

Traditional rulers are graded in centimeters with an accuracy of up to 0.1mm for the most precise ones. These are excellent for taking general measurements, such as the length of a door.

However, when you need to measure the thickness of an object in mm with an accuracy of 0.02mm, a digital caliper comes in handy.

Digital calipers can also be used to measure the internal and external diameters of objects.

They are also used in the educational sector, where instructors teach students the fundamentals of workshop tools.


How to Use a Digital Caliper?

Digital calipers are extremely user-friendly instruments, especially with the digital display, which eliminates the stress of manually picking readings.

Even with the available digital displays and sensors, there are a few simple rules or guidelines to follow when using digital calipers to ensure accurate results.

  • Before taking measurements, always zero your calipers. Not all calipers include an ABS measurement scale with the current position marked as the origin point.

When using digital calipers, close the jaws properly and then use the zero button on the calipers to zero the calipers before taking measurements.

  • When measuring external diameters, use the outer jaws of the calipers. Before taking the measurement, make sure the object is parallel to the calipers’ outside jaws. Failure to do this would result in an inaccurate measurement.
  • When measuring the thickness of an object with the calipers’ external jaws, make sure the object is perpendicular to the calipers’ jaws.
  • Use the internal jaws of the calipers to measure an object’s internal diameter. Make sure the object is perpendicular to the calipers’ internal jaws before collecting measurements.
  • Use a depth gauge to measure the depth of an object from its surface to a reference point, which can be a flat table or surface. A good rule of thumb is to make sure the calipers are perpendicular to the object’s surface.
  • The step gauge should be used to take step measurements from one edge to another.



Digital calipers are gradually phasing out veneer calipers, and every manufacturer is jumping on board to get a piece of the action.

With so many manufacturers to choose from, a newcomer may find it difficult to choose a caliper.

However, after extensive research and experiments conducted by our team of experts, the Mitutoyo coolant-proof digital calipers emerged as the overall best in various situations and work environments.

The Mitutoyo digital calipers have an IP67 protection rating, an extended battery life, and a premium durable finish capable of lasting for years, hence our choice pick for anyone looking to get a digital caliper.

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