Clegg Hammer Impact Soil Tester – 4.5 kg
The 4.5 kg Clegg Hammer (Clegg Impact Soil Tester) is the standard tool for rapid, in-situ assessment of soil stiffness and compaction in the field. Widely used by geotechnical engineers, civil contractors, and ground investigation teams across the UK, it delivers an immediate Clegg Impact Value (CIV) readout that correlates directly with California Bearing Ratio (CBR) — eliminating the time and cost of laboratory testing on site.
How It Works
A standardised drop hammer falls from a fixed height onto the ground surface. The instrument measures deceleration on impact and displays an instant CIV reading on the digital screen. This value converts to an approximate CBR using established correlations widely accepted in UK geotechnical practice.
Typical Applications
- Subgrade and subbase compaction control during road and pavement construction
- Pavement design and quality assurance for highway engineers
- Earthwork acceptance testing on infrastructure and civil engineering projects
- Agricultural land and sports pitch stiffness assessment
- Rapid site screening ahead of laboratory testing
Key Features
- 4.5 kg drop hammer — standard mass for agricultural and light engineering applications
- Instant digital CIV readout — no manual calculation required in the field
- Robust, field-ready construction built for UK site conditions
- Compact and portable — ideal for remote or difficult-access locations
- Results correlate with CBR values using established geotechnical reference tables
Available for purchase and equipment hire from Geo Site Supply. UK stock — fast delivery. Contact us for project quantities or hire enquiries.