Compass, Plastic, for Blackboard, 45cm Manufacturer,Supplier and Exporter in India

Compass, Plastic, for Blackboard, 45cm (Product Code: SLE/CS/015) is a large demonstration compass that holds a stick of chalk and draws circles, arcs and constructions on the chalkboard, so pupils can follow each step before trying it with their own geometry sets. A suction foot grips the board at the centre point, and a metal butterfly screw lets the teacher set the radius and tighten the joint by hand. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, a school lab equipment manufacturer in India that produces a matching set of blackboard geometry instruments.

Specifications

Typical Use

Teachers use the compass to draw circles of a given radius, bisect lines and angles, construct triangles from three sides, and show how the radius, diameter and circumference of a circle relate. Press the suction foot onto a clean, smooth part of the board, set the opening against a board ruler, then lock the joint with the butterfly screw so the radius does not drift mid-stroke. On surfaces where suction will not hold, swap in the soft plastic compass point instead.

The holder accepts both round and square chalk, so the compass works with whichever sticks the school buys. Loosen the screw slightly after class to relieve pressure on the joint, and keep the suction foot free of chalk dust so it keeps its grip. When equipping a maths room as part of a new lab setup in an Indian school, it is usually ordered with the blackboard ruler, protractor and set squares so teachers have a complete construction kit.

Manufacturer

Jain Scientific Equipments Private Limited manufactures this compass under its ScienceLab trading name in Ambala, Haryana, and ships board instruments and other teaching aids to schools in India and international markets. Visit our company profile to learn more.

Related Classroom Student Products

Instruments and supplies that complete a board construction lesson with this compass:

• Ruler, Plastic, Blackboard, 100cm — for setting the radius and drawing chords and diameters.
• Protractor, Plastic, for Blackboard, 44cm — to measure the angles produced in bisection and triangle constructions.
• Set Square, Blackboard, 45-45-90 degrees — for drawing perpendicular lines through the centre point.
• Chalk, White — round chalk sticks to load into the adjustable holder.
• Blackboard, Double-sided, 1160 x 760 mm — a smooth board surface for the suction foot to grip.

See all board instruments in the Classroom Student category.

Frequently Asked Questions

The title says 45cm but the specification says 40cm — which is correct?
Our product specification lists the compass as 40cm long. Please confirm the size you need through our contact page before ordering, and we will state it on your quotation.

Will it hold square chalk?
Yes. The chalk holder has an adjustable mechanism that takes both round and square chalk.

How does it stay in place on the board?
It has a soft plastic suction foot, which is interchangeable with a soft plastic compass point.

How is the opening locked?
A sturdy metal butterfly screw adjusts the tightness of the joint by hand, so no tools are needed.

How should it be looked after?
Wipe the hard white plastic body with a damp cloth, keep the suction foot clean and store the compass with the screw slightly loosened.

What details should a school send for a quotation?
The product code SLE/CS/015, the quantity, delivery address and any tender clauses; we supply schools and distributors in India and international markets.

Request a Quote

Add the blackboard compass to your enquiry cart or write to us on the contact page for pricing and availability.

Last updated: 24 September 2026