Tension Protractor

Product Code: ME-6855


The Tension Protractor is a spring scale and a protractor integrated into one device. Perfect for static equilibrium experiments, the rotary dial indicates the tension in the string and the angle is read where the string passes over the degree scale on the outer ring. Since the Tension Protractor is supported on a rod, it has an advantage over other spring scales that tend to weigh down the string, changing the angle.

The string is wrapped once around a small pulley that is spring-loaded. The torsion spring scale is carefully calibrated at the factory and can be zeroed by the user using the thumb screw on the back. The red arrow that indicates tension is color-coded to match the Newton scale.

Even if the mounting rod is not plumb, the Tension Protractor’s degree scale can be adjusted to read 90 degrees vertically by rotating the outer ring until the string with a hanging mass aligns with 90 degrees.


  • Conveniently measure both Tension and Angle
  • Large Scale for Viewing Demonstrations
  • Zero-Adjust for Torsion Spring Scale
  • Built-In Rod Clamp for quick horizontal or vertical mounting

What’s Included

  • 1x Tension Protractor

Project Specifications

Force Range 0 N to 10 N
Smallest Force Division 0.1 N
Force Accuracy ±4% of Reading
Angle Range -90° to +90°
Smallest Angle Division
Diameter 15 cm

Recommended Accessories

Large Table Clamp ME-9472
90 cm Stainless Steel Rod ME-8738
Multi-Clamp ME-9507
Hooked Mass Set SE-8759


Perform the following experiments and more with the Tension Protractor.
Visit PASCO’s Experiment Library to view more activities.

Support Documents

Manual Downloads

Product Manuals for the Tension Protractor (ME-6855)