Have you ever wondered how builders make perfectly straight buildings? With the protractor! Or at least this is one of the indispensable tools and is used to measure angles, so that a building or even other elements belonging to the construction, carpentry, mechanics and DIY fields, are built or mounted at the correct angle.

We find mainly two types of protractors, the analog ones, and the other digital ones, the latter made by including other instruments such as laser levels and inclinometers. They are the measuring tool that cannot be missing from any professional’s toolbox.

Here we had selected some of the best digital protractors for you that are given below.

SaleRANK NO. 1
Klein Tools 935DAG Digital Electronic Level and Angle Gauge, Measures 0 - 90 and 0 - 180 Degree Ranges, Measures and Sets Angles
  • This Digital Angle Gauge and Level can measure or set angles, check relative angles, or can be used as a digital level
  • High visibility reverse contrast display improves visibility in dimly lit work environments
  • Strong magnetic base to attaches to conduit, pipes, saw blades, vents, ducts, and other ferromagnetic surfaces
  • V-groove edges enable optimal alignment on conduits and pipes for bending and alignment
  • 0 to 90-Degree and 0 to 180-Degree measurement ranges facilitate multiple and diverse applications
SaleRANK NO. 2
General Tools 822 Digital Angle Finder Rule, 5-Inch
  • Digital stainless steel ruler and angle finder combo makes precise measurements for easy woodworking
  • Digital protractor has lock and reverse angle functions that make all types of work easy and fast
  • Hinge mechanism on the angle rule allows a full 360-degrees to measure inside outside and reverse angles
  • Woodworking tool can be zeroed at any point in the swing; digital measuring stick has a length of 5 inches
  • Protractor comes with a large easy-to-read LCD display; never guess or eye ball the angle and length again with one convenient tool
SaleRANK NO. 3
GemRed 82305 Digital Angle Finder Protractor (Stainless steel, 7inch/200mm)
  • 【2 Functions' Combination】Ruler and protractor combination for easy measuring inside and outside angles. 【Digital Display】Easy to read.
  • 【Durable Rulers】Well-made stainless steel rulers and laser etched measurements offer clear reading and years' usage.
  • 【High Accuracy】Accuracy of this protractor is ±0.3 degree. It is a good choice for most projects like woodworking, crown molding and daily use. Folded length: about 7.5 inch/220mm.Total length 400mm.
  • 【Locking Function】For read it easily, GemRed angle finder could be locked at any angle. *NO REVERSE ANGLE/DISPLAY FUNCTION.
  • 【Notes】Stainless steel edge is sharp, please be cautious while using AND KEEP IT AWAY FROM CHILDREN.*SCRATCHES ON RULERS ARE RESULTED FROM TOUCHING WITH EACH OTHER. IT MAY APPREAR ON BRAND-NEW PRODUCT.
RANK NO. 4
General Tools 828 Digital Sliding T-Bevel Gauge & Digital Protractor in One
  • DURABLE - Commercial grade digital sliding T-bevel and digital protractor with impact resistant ABS handle
  • HOLDS MEASUREMENTS- on digital angle finder for transfers between different surfaces or jobs
  • TRANSITIONAL DISPLAY - Digital angle gauge has a reverse display button and flip display button with a locking knob for manual measurement transfer. Full LCD display with large digital angle readout.
  • AUTOMATIC SHUT-OFF- feature that preserves battery life of the woodworking tool
  • DUAL APPLICATION - T-bevel/digital protractor combo- is made with an ergonomic impact resistant handle with 8-inch stainless steel blade used for taking measurements
SaleRANK NO. 5
General Tools 1702 6-Inch Stainless Steel Pivoting Arm Digital Protractor
  • Large, easy-to-read display
  • 6-inch (150mm) Stainless Steel Protractor Arm with Knurled Locking Nut
  • Display can be inverted for easy reading
  • Hold function to freeze measurement
  • Thumb Screw will lock arm in any position
RANK NO. 6
Neoteck Aluminum Digital Angle Finder Protractor 225° 16 inch Backlit LCD Digital with Horizontal and Vertical Bubble - Silver
  • 【Digital Angle Finder Protractor】 with High Accuracy, Delicate Design and Modern Appearance, An Interior Designer Should Have One!
  • 【High Accuracy】 Angle Range is 0-225°, Measuring precision: ±0.5°, Increase/Decrease Angle: 0.1°
  • 【Data Hold】If You Want to Use Data Holding Function, You Need to Press the HOLD Button in Red rather than Twist the Knob. (The Knob is Just for Loosening and Tightening. It Can't Hold the Angle Firm Completely!)
  • 【Backlit LCD Display】 Come with Backlit LED Display Which Makes it Possible to Read the Data Clearly, Even under a Low Light Circumstance
  • 【With Horizontal and Vertical Bubble Level】 It Also Can Be Used Like a Spirit Level, Helping You to Check and Calibrate (NOTE: It is NOT a Digital Level. Will Not Display a Number on LCD, Just Only Assist You to Judge If It Is Horizontal / Vertical or Not)
RANK NO. 7
Digital Angle Gauge, Protractor, Inclinometer, Bevel Gauge, Magnetic Angle Finder with V-Groove Magnetic Base, Horizontal Level Bubble, Backlight Display for Band Saw, Table Saw Blades, Miter Saw
  • 【Great Accuracy and Consistency】 Angle gauge provide accurate measurement of ±0.1°and resolution of 0.05°. It is used to measure or set angles, check relative angles, measure bevel angle of miter saw, automobile test and repair, and so on.
  • 【Strong V-Groove Magnetic Base & Level Bubble Vial】Magnetic level angle finder has V-groove and built-in powerful magnets on the base that can be firmly attached to miter saws, band saws, table saw blade, pipes, conduits, and other metal surfaces. And Its horizontal level bubble can help judge the tilt direction of the product.
  • 【Backlight Auto-Rotating Display & Easy to Read】Digital inclinometer has a bright backlight auto-rotating display for quick and easy viewing at any angle even when working at night. Besides, the hold function can help you save measurements and the ''Erro'' function will remind you to place it vertically to get a correct reading.
  • 【Wide Applications】The protractor is portable and convenient, especially useful for completing work on ladders, roofs or other dangerous locations, can be used in woodworking, welding, fabrication, construction, machinery, home renovation, automobile etc.
  • 【Satisfactory Service】INKUEN provides a 12-month warranty: the package includes 1 x Digital Level Angle Gauge, 1 x Carry Bag, 1 x Instructions. If you encounter any problems, please contact us, we promise to help you solve the problem.
RANK NO. 8
Inclinometer, RISEPRO Digital Protractor Angle Finder Level Inclinometer Magnetic V-Groove 0~360 degree with Backlight 82413B
  • USEFUL 3-IN-1 DEVICE – This newest digital gadget features with protractor, angle finder and level in one measuring tool. Large and ultra clear display helps you to work at dark condition.
  • WIDE APPLICATIONS – Great tool for automotive, wood & mechanical industries, machinery, medical fields and etc
  • V GROOVE BASE – The V Groove base with strong magnets enables strong attachment over a curve or cylindrical magnetic surfaces such as metal pipeline or shafts
  • CONVERTS ANGLE TO OTHER UNITS : Conversions between : 4 x 90˚ m/m : 1000mm/m, % : 100%, in/ft : 12in/ft. No more guessing or fuzzy conversion!
  • ABSOLUTE & RELATIVE MEASUREMENT – The regular absolute measurement mode can only measure the angle against horizontal plane. This tool also features with relative measurement mode for quickly measuring angle between two measured surfaces.
SaleRANK NO. 9
GemRed Digital Angle Finder Protractor (Aluminum, 200mm)
  • 【Good Choice for Beginners】Ruler and protractor combination for easy measuring. Great gift for woodworker, constructor DIYers etc.
  • 【New Color】Black ruler and white scale make it easier to read.
  • 【High Accuracy】Accuracy of this protractor is ±0.3 degree. It is a good choice for most projects and daily use. Folded length: about 7.5 inch/220mm.Total length
  • 【Rounded edge】Protect your fingers
  • 【Locking Function】For read it easily, GemRed angle finder could be locked at any angle.
SaleRANK NO. 10
Digital Angle Finder Protractor, Preciva 7 inch/200mm Stainless Steel Measuring Ruler with Large LCD Display for Woodworking, Construction (CR2032 Battery Included)
  • 【Large LCD Display & High Precision】 Preciva digital protractor is equipped with a large LCD display for easy reading; Measuring Range: 0~999.9°; Accuracy ±0.3°; Resolution 0.1°
  • 【Locking Function】Convenient locking screw-by pressing the screw, the ruler can be kept at any angle.For maintain its accuracy and read it easily, Preciva angle finder could be locked at any angle.
  • 【2 in 1 Digital Protractor】Digital stainless steel ruler and angle finder combo makes precise measurements.the hinge mechanism on the angle rule allows complete 360-degree measurement of internal and reverse angles; The protractor combines standard and metric scale scales.Relative and absolute angle measurement.
  • 【Durable Rulers & Low Power Consumption】The digital protractor angle gauge & angle finder durable stainless steel body can be used for a long time; HOLD and RESET function, laser engraving scale, clear and accurate, will not fall off.In addition, it also has the advantage of energy saving, it will automatically close after 6 minutes of inactivity.
  • 【Battery Included】Large capacity standby with automatic power-off function ,use a CR2032 button battery to work for more than 2000 hours .Saving power consumption and extending battery life.
RANK NO. 11
URPRO Digital Protractor Angle Finder Gauge Spirit Level Inclinometer Magnetic V-Groove with Backlight
  • USEFUL 3 -IN-1 DEVICE WITH BRIGHT DISPLAY - This newest digital gadget features with protractor, angle finder and level in one measuring tool. Clear bright display helps you to work at dark condition.
  • WIDE APPLICATIONS - Great tool for automotive, wood & mechanical industries, machinery, medical fields and etc.
  • V GROOVE STRONG MAGNETIC BASE - The V Groove base with strong 3 magnets enables strong attachment over a curve or cylindrical magnetic surfaces such as metal pipeline or shafts
  • CONVERTS ANGLE TO OTHER UNITS : degrees˚ , %, mm/m and in/ft : No more guessing or fuzzy conversion!
  • ABSOLUTE & RELATIVE MEASUREMENT – The regular absolute measurement mode can only measure the angle against horizontal plane. This tool also features with relative measurement mode for quickly measuring angle between two measured surfaces.
RANK NO. 12
Circles in the Snow: A Bo Tully Mystery (Sheriff Bo Tully Mysteries Book 6)
  • Amazon Kindle Edition
  • McManus, Patrick F. (Author)
  • English (Publication Language)
  • 240 Pages - 06/07/2014 (Publication Date) - Skyhorse (Publisher)
RANK NO. 13
Digital Angle Finder Ruler, Preciva 7.5inch/200mm Digital Protractor Stainless Steel Angle Ruler with Large LCD Display and Zeroing/Locking/Reverse Functions (CR2032 Battery Included)
  • Large LCD Display: This Digital protractor is equipped with a large LCD display for easy reading; measuring range: 0 ~ 999.9 °; accuracy ± 0.3 °; resolution 0.1 °.
  • Lock and Reverse angle functions: You can hold and keep the reading by pressing the HOLD function button, it also comes with a Reverse Function Button, When you measuring large angle and doing reverse measurement, The display could read up-side-down. Easy to read, laser engraving scale, clear and accurate.
  • Stainless Steel Body: Durable stainless steel body can be used for a long time; use a CR2032 button battery to work for more than 2000 hours (CR2032 Battery included).
  • Zeroing at Any Angle: Zero-adjust at any angle under the relative measurement angle of a button; the locking screw is used to maintain the measured reading at any time; it will be automatically shut off after 6 minutes of inactivity.
  • Quick and Accurate Reading: The combination of digital stainless steel ruler and angle finder can make accurate measurement; the hinge mechanism on the angle ruler allows a complete 360 degree measurement of internal and reverse angles.

Buying Guide to Select the Best Digital Protractors

Many manual jobs, related to DIY, construction, the manufacture of machines, and the development of musical or mechanical instruments, generally require precision meters, such as protractors. This product will allow you to perform exact measurements of vertical, horizontal, and uniquely angular surfaces.

What Is a Protractor?

The protractor is an instrument in the shape of a circle, or a semicircle graduated at 360 ° or 180 ° that allows you to measure the angles between two objects and that has been used since ancient times.

Traditionally these tools were used to measure two points of a coast or the position of a star and the horizon. They can determine the latitude in which they are located with straightforward mathematical calculations to be performed very precisely.

Traditional protractors were also called sextants, while these days these tools have further evolved and are used in construction, carpentry, mechanical production workshops, and DIY.

What Is a Protractor For?

Protractors are used to measure and check the angles between two surfaces with a standard edge (a point). For example, they can be two walls, a roof, the slope of a ramp concerning the horizontal plane of the floor, or the two faces of a prism that you need to weld.

As you can see, the applications are various. Digital protractors, in combination with a tape measure, an inclinometer, or a spirit level, are especially suitable for any construction job.

They also serve to measure the cutting angle of the pieces used in the manufacture of furniture, machinery, and even musical instruments, and it is, therefore, a valuable aid in precision work.

What Is Your Usual Use of A Protractor?

As we have already mentioned, protractors can be used for a wide variety of jobs and in different sectors. It is common to see them used for both professional and minor employment at home, as they offer great ease in carrying out delicate jobs and can be used in conjunction with other measuring tools.

Below we list in detail some of the work you can do with your protractor, whether you want to use it in the workplace or to use it at home without any complications:

  • Installation of shelves and cabinets.
  • Installation of door and window frames.
  • Decoration of indoor and outdoor spaces.
  • Construction works.
  • Carpentry works.
  • Pipe installation.
  • Production of musical instruments.
  • Machinery production.
  • Installation of hinges for doors and windows.
  • Physiotherapy.

What Are the Differences Between Protractors and Levels?

The laser levels are used to control the verticality or horizontality of a surface. Their function, in fact, of both digital and analog models, is to determine whether a plane is correctly levelled.

On the other hand, these tools have other capabilities than leveling, such as measuring distances or angles. Protractors are used to measure acute, right, and obtuse angles between two floors that can be two walls, a gable roof, the angle between two pieces that you need to weld, or want to join. Some digital protractors may also have leveling functions, and many models incorporate the traditional spirit level.

In Addition to Measuring Angles, What Else Can I Do with A Protractor?

In addition to measuring, the most critical use of a protractor is the transport of angles. What does it mean to transport corners? It involves measuring an angle, for example, the angle of a beam about the wall or a column, and then carrying it on a cutting element to make a precise cut that adapts to the desired inclination.

This is a particularly important application for work with oblique cuts to be performed with a miter saw or with a circular table saw. These types of operations are prevalent in carpentry.

For example, when there is a need to adapt the measurements of a piece of furniture to a space that is located in a false square. The transport of corners is also used in construction and artisanal production.

What Are the Advantages of A Digital Protractor Compared to An Analog One?

Analog (traditional) protractors are little more than an angular conveyor with a ruler attached to the centre that rotates freely around its point of attachment. The base of the conveyor is applied to one of the surfaces while the ruler is placed on the other: the angle can, therefore, be measured by the central graduated disk.

Digital protractors avoid complicated dial readings as they show information on an LCD; in addition, many models offer other functions such as angle conversion. Here are some of the main advantages of a digital protractor:

  1. They show information on an LCD.
  2. They have a backlight so that you can work in low light conditions.
  3. They offer the conversion of angles into sexagesimal (most used), centesimal, or radiant degrees.
  4. They allow you to store measurements and download data to a smartphone or computer.
  5. They are faster since you need to apply them on the surface to be measured.
  6. Some protractor models have applications that allow you to use them together with other elements such as a laser level or a laser meter.

What Can I Integrate My Protractor With?

As we have just finished explaining to you, protractors work very well together with other measuring instruments such as spirit levels, inclinometers, and laser meters. Some models (the largest ones) usually have a space in one of the arms, designed to insert a laser meter, but can also be used with spirit levels.

A little known trick is to combine the protractor with a laser meter thus obtaining an arm of infinite length. To do this, place the main arm above the reference surface and the other arm above the surface to be measured. If you want to project the angle, place the laser meter on the same weapon to make it project the laser line with maximum precision.

Is a Protractor or An Inclinometer with A Laser Meter Better?

You must keep in mind that these two instruments perform very different functions: although some laser meters include inclinometer functions.

The angle measurements they offer will never be as precise as those of a protractor. This instrument instead provides an angle measurement exact and very reliable, unlike the inclinometer that detects the differences in height.

As we previously told you, it is possible to combine both devices to measure angles, level, and distance with a single instrument, but our advice is not to try to use one to replace the other. Protractors are very inexpensive devices, and it is worth investing in them to avoid problems.

What Kind of Maintenance Does a Protractor Require?

As these are precision instruments, protractors need to be treated with some care. Remember that a blow or a fall could damage its mechanism and block it or worse still make it malfunction. You can’t afford to take wrong measurements for important angles, so we recommend following some safety criteria.

Below we show you what these criteria concerning the safety and maintenance of protractors that will be very useful for you to preserve these tools optimally, also adding some tips are.

  • Avoid forcing him or getting hit.
  • When you open the arms to measure the angles, make sure not to push the mechanism.
  • If the protractor has a brake, never force it. The tool must rotate freely.
  • Always keep the protractor in its case.
  • Store the instrument in a cool, dry place away from sources of moisture, sunlight, and corrosive products.
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