The Model 3430 offers you a choice of backscatter or direct transmission for density measurement and backscatter for moisture measurement. The Model 3430 adheres to ASTM Standard Test Methods D-6938 (which replaced ASTM D-2922 and ASTM D-3017 as of November 2006), D-2950, C-1040 and AASHTO T-310. The gauge directly displays wet density, moisture, dry density, percent moisture, percent compaction, void ratio and percent voids in English or metric units.

Troxler 3430 Brochure (Nuclear Density Gauge)