The Clegg Impact Soil Tester CIST/882 provides rapid, accurate field evaluation of soil compaction and structural strength. Featuring a 4.5kg drop hammer and digital readout unit, it measures peak deceleration to calculate Impact Value (IV), giving instant correlation to California Bearing Ratio (CBR) values for trench reinstatements, road foundations, and earthworks.
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The Clegg Impact Soil Tester CIST/882 (4.5kg Classic Model) is an industry-standard instrument used across civil engineering, utility contracting, and groundwork operations to verify surface compaction and load-bearing capacity. Designed to eliminate time-consuming laboratory testing, the CIST/882 delivers instant on-site strength measurements for trench reinstatements, sub-bases, aggregates, and road foundations. The system comprises a precision 4.5kg compaction hammer operating within a vertical guide tube. When released from a fixed height, the hammer strikes the test surface, decelerating at a rate determined by the stiffness and compaction level of the material. A precision accelerometer mounted to the hammer transmits the deceleration signal to a hand-held digital readout unit, which processes and displays the reading in units of Impact Value (IV). Because Impact Value directly correlates with traditional California Bearing Ratio (CBR) results, field engineers can immediately verify structural compliance and sign off compaction layers. Housed in a rugged casing with a backlit display and powered by a standard 9V battery, the CIST/882 ensures reliable, repeatable testing in demanding site conditions.
