Comprising a steel rod of 120cm long and 1.2 cm dia  with pointed ends, carring two adjustable knife edges facing each other. Two metal weights (made of iron c.p) of dimension 7.5 × 3.75cm (length × diameter) and (3.5 × 3.75cm) respectively can be made to slide along the length of the rod and can be clamped in any position by thumb screw two other material  weights exactly similar to metal weights can also slide along the rod. Supplied with wall bracket.

Kater's pendulum is a reversible, free-swinging pendulum. Its based upon the principle that centre of oscillation and centre of suspension are interchangeable. allowing greater accuracy ,It is an effective instrument to verify the Acceleration due to Gravity 'g'.