Windsor Probe & Pin Test

The Windsor Probe and Pin Testing Systems are widely recognized non-destructive methods used to evaluate the in-place compressive strength of concrete, mortar, and masonry. These tests are particularly valuable when:

• Concrete compressive strength records are missing or disputed
• Coring is not feasible or permitted
• Rapid results are required on existing structures

The Windsor Probe Test involves firing a precision ¼-inch steel probe into the surface using a 0.32-caliber powder cartridge. The depth of penetration, which correlates with compressive strength, is measured against calibrated charts. The method is applicable for normal-weight and lightweight concrete with strength up to 17,000 psi (110 MPa).

The Windsor Pin Test uses a spring-loaded, non-explosive device to drive a small-diameter steel pin into the material. Its unique design allows for accurate in-situ testing of brick mortar joints as well as thin or delicate masonry components.

Both systems are portable, reliable, and safe to use in field conditions, and are often the preferred method of structural engineers for quick strength estimation when coring is not viable.