Tension Protractor for School, Colleges and Universities Purpose.

The Tension Protractor combines a spring scale and a protractor into a single device for measuring string tension and angle simultaneously. It is ideal for static equilibrium experiments. The rotary dial indicates the tension in the string, while the angle is measured where the string passes over the degree scale on the outer ring.

The device is supported by a mounting rod, preventing the instrument's weight from affecting the string angle, unlike conventional spring scales. The string wraps once around a small spring-loaded pulley. Its torsion spring scale is factory-calibrated and can be zero-adjusted using the thumb screw at the back. A red pointer indicates the tension and matches the Newton scale for easy reading.

The outer degree scale can be rotated to align a hanging string with the 90° mark, allowing accurate vertical angle measurement even when the mounting rod is not perfectly vertical.

Designed and manufactured by Atico Export to meet the practical requirements of modern physics laboratories and educational training facilities.

Working principle :

The string is wrapped once around a spring-loaded pulley connected to a torsion spring mechanism. The applied tension causes the mechanism to rotate, and the calibrated dial indicates the force in Newtons. The angle is read directly from the outer degree scale at the point where the string passes over it.

The scale can be zero-adjusted using the rear thumb screw. The outer ring can also be rotated to align the degree scale with the vertical direction for accurate measurements.

What's included :

• 1 × Tension Protractor.

• Measurement of string tension.
• Measurement of angles in force systems.
• Static equilibrium experiments.
• Investigation of forces acting at different angles.
• Demonstration of force balance and vector resolution.

Force Range : 0 to 10 N

Force Accuracy : ±4% of reading

Smallest Force Division : 0.1 N

Angle Range : ±90°

Smallest Angle Division : 1°

Diameter : 15 cm

• Measures string tension and angle simultaneously.
• Combines a spring scale and protractor in one device.
• Large, easy-to-read scale for classroom demonstrations.
• Zero-adjustment mechanism for the torsion spring scale.
• Built-in rod clamp for quick horizontal or vertical mounting.
• Spring-loaded pulley for tension measurement.
• Colour-coded red pointer for easy force reading.
• Adjustable outer degree scale for accurate vertical alignment.
• Suitable for static equilibrium experiments.