Proceq Pendulum Hammer OS-120

Abbey Spares and Supplies Ltd

The Proceq Schmidt OS-120 Pendulum Hammers are designed to test on softer material such as light weight concrete, gypsum boards, fresh concrete and the mortar of joints in brickwork. Their unique design allows easy to handle measurements on vertical and horizontal surfaces.

Proceq Schmidt OS-120 is the only rebound hammer worldwide working with the pendulum system, thus it must not be loaded on the test surface. The larger plunger surface on the Schmidt OS-120PT allows tests on soft concrete starting with a compressive strength of 1 MPa.

Type PT:

Equipped with a larger plunger surface, it is especially designed to test on softer material such as light weight concrete, gypsum boards and on fresh concrete. It is often used to determine the right time to remove formwork.

Type PM:

Designed to test the mortar joints in brickwork. It has a specially developed plunger whose shape ensures the impacts are applied to the surface of the joint. Based on the rebound values the mortar quality can be classified.


The rebound number is determined on the basis of the following standards: EN12504-2 (Europe), ASTM C 805 (North America), JGJ/T 23-2011 (China). Applies to Schmidt OS-120PT only.

For the creation of user defined conversion curves, we recommend the procedures described in EN 13791 (Europe), ASTM C805, ACI 228.1R (North America), JGJ T23-2011 (China). Applies to Schmidt OS-120PT only.


Austrian Guideline for tunnel lining, published December 2012. Austrian Construction Association. (To determine the time for formwork removal during tunnel construction). Applies to Schmidt OS-120PT.

TNO Report BI -88-009/61.8.2060-VOE from IBBC Delft Netherlands (Mortar joint testing). Applies to Schmidt OS-120PM.

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