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    Two Arm Stainless Steel Angle Protractor, 90x300mm

    The two arm protractor made of high quality stainless steel, which is durable and wear resistant, not easily rusted and can be used for a long time. ATO 180 degree protractor has applications in engineering, angle measurement, student drafting, architectural design, woodworking, and length measurement.
    SKU: ATO-AP-TA300
    This product has a minimum quantity of 5
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days

    Low price metal protractor, size 90x300mm, allows the user to plot at a fixed angle and is suitable for setting mitres, drawing radial lines, measuring and marking angles. Its two arms allow for precise angle measurements, making it a must-have tool for carpenters, engineers, DIY enthusiasts and more.


    • Model: ATO-AP-TA90300
    • Measuring Range: 0-180 degrees
    • Size: 90x300mm
    • Total Body Length: 359mm
    • Diameter of Disc: 90mm
    • Width: 13/17mm
    • Body Thickness: 1.2mm
    • Weight: 160g


    • 90x150mm Stainless steel angle protractors are highly accurate and precise in measuring angles, ensuring that your measurements are as close to perfect as possible.
    • The 180-degree angle finder ruler has a laser scale for accurate and practical reading.
    • The two arm stainless steel construction of angle protractors makes them very durable and resistant to wear and tear, ensuring they can withstand frequent use and last for a long time.
    • ATO two arm stainless steel angle protractor is lightweight and compact, making them easy to carry around and use on the go.

    Scribing method

    Angle protractor scribing method

    1. Adjust the protractor to the right angle and tighten the nut.
    2. Draw the desired angle and figure along the edge of the ruler.

    Measuring Method

    Angle protractor measuring method

    1. Fit the protractor measurement close to the work.
    2. Adjust the semicircle to fit the other side of the workpiece.
    3. Just take a reading.

    Dimension (Unit: mm)

    90x300mm Angle protractor dimension



    Angle protractors are commonly used in fields such as construction, engineering, and carpentry to measure angles for cutting and fitting materials. They are also used in mathematics and physics to solve problems involving angles and trigonometry.
    Angle protractor applications

    Tips: What are some tips for using an angle protractor effectively?

    • Understand the different parts of the angle protractor: Most angle protractors have two arms, one of which is fixed while the other is adjustable. The adjustable arm is used to measure the angle, while the fixed arm is used as a reference point.
    • Place the protractor correctly: Place the protractor on the angle to be measured with the fixed arm aligned with one of the sides of the angle.
    • Read the angle measurement: Read the measurement from the scale on the adjustable arm of the protractor. Make sure to read the angle from the correct scale, either degrees or radians.
    • Use a straight edge: When drawing an angle, use a straight edge to draw the sides of the angle, making sure to align the straight edge with the reference line on the angle protractor.
    • Double-check the measurement: After measuring or drawing an angle, double-check the measurement to make sure it is accurate. Check that the angle measurement is consistent with the known properties of the angle, such as the sum of the angles in a triangle adding up to 180 degrees.
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