 Standard Hammer
The 4.5 kg "Standard" Clegg Impact Soil
Tester was the first Clegg Hammer developed by Dr. Baden Clegg in the
1970's. It was initally concieved for basecourse testing but has
turned out to be the "general purpose" Clegg. It is based on the
instrumentation of a "modified proctor" labotratory compaction hammer. The
Hammer mass is 5 cm in diameter at 4.5 kg and is dropped from a set height
of 45 cm. In the GTM style, the weight of the guide tube and metre is
approximatley 1.6 kg. The shipping case weighs approximatley 6 kg. The
total weight is a bit over 12 kg. Instrument height is 70 cm and the
guide tube is 15 cm in diameter. The shipping case is around 25
cm by 25 cm by 80 cm. The output of the standard Hammer when dropped from
its standard height is known as the Clegg Impact Value (CIV). | 
Impact Soil Tester 
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