Protractor, Plastic, for Blackboard, 44cm Manufacturer,Supplier and Exporter in India

Protractor, Plastic, for Blackboard, 44cm (Product Code: SLE/CS/012) is an oversized semicircular protractor for measuring and constructing angles directly on the chalkboard, so an entire class can watch each step of an angle exercise. Its full 180 degree scale is marked in single degrees, and a detachable handle lets the teacher hold it steady against the board while drawing. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, whose range as mathematics lab equipments manufacturers covers the full set of blackboard geometry instruments.

Specifications

Typical Use

In a geometry lesson the teacher places the centre mark of the base on the vertex, aligns the zero line with one arm of the angle and reads off the value where the second arm crosses the scale — exactly the routine pupils then repeat with their own small protractors. It is also used to construct given angles, classify acute, right, obtuse and straight angles, show that angles on a straight line add up to 180 degrees, and draw the sectors of a pie chart on the board.

Grip the handle firmly and keep the flat base pressed to the board so the scale does not slip while you mark the point. Remove the handle when storing the protractor flat in a drawer, and wipe off chalk dust after each lesson to keep the degree markings readable. It is a standard entry on the lab equipment list for a school maths room in India, together with a board ruler, compass and set squares.

Manufacturer

ScienceLab is the brand under which Jain Scientific Equipments Private Limited, based in Ambala, Haryana, manufactures classroom mathematics aids and science teaching equipment for schools in India and international markets. Read about the company on our company profile page.

Related Classroom Student Products

Other board instruments and supplies teachers reach for in the same angle and construction work:

• Ruler, Plastic, Blackboard, 100cm — draws the straight arms of the angles you measure.
• Compass, Plastic, for Blackboard, 45cm — for arcs in angle bisection and triangle constructions.
• Set Square, Blackboard, 30-60-90 degrees — lets pupils check protractor readings against fixed angles.
• Set Square, Blackboard, 45-45-90 degrees — a quick reference for right angles and half right angles.
• Chalk, Assorted Colors — to mark each arm or angle in a different colour.

More classroom teaching aids are listed in the Classroom Student category.

Frequently Asked Questions

What range and resolution does the scale have?
The scale covers 180 degrees in 1 degree divisions, suitable for whole-class angle measurement.

How big is the protractor?
The base measures 440mm, and the body is cut from 4.5mm rigid plastic so it stays flat against the board.

Is the handle fixed?
No, the handle is detachable, which makes the protractor easier to pack and store.

Can it be used on a whiteboard?
It is designed as a chalkboard teaching aid; on other flat writing boards it can still serve as a guide for a marker, held in place by its handle.

Is there a warranty?
Warranty terms are confirmed with each quotation. Please ask through our contact page if you need them in writing.

How do I order sets for several classrooms?
Quote the product code SLE/CS/012 with the quantity and delivery location; with an estimated 0.278kg weight per piece, class sets pack compactly for dispatch across India and to international markets.

Request a Quote

Place the 44cm blackboard protractor in your enquiry cart, or write to us via the contact page with quantities and any tender specification.

Last updated: 24 September 2026