The CoreLok® System from InstroTek® The Industry's Most Versatile Testing Product - ASTM D6752, ASTM D6857, ASTM D7063, AASHTO T331 Bulk Specific Gravity, Maximum Specific Gravity, & Aggregate Specific Gravity, Porosity & % AC Want to run Aggregate Specific Gravities, choose the Agg Plus System found HERE Highly reproducible and accurate density measurements The included GravitySuite™ PC software package calculates and manages your data for ease of operation – Requires download and code from InstroTek One Machine for All your Gravity Measurements of Asphalt and Aggregate Includes Water Tank & Hanging Basket Analog vacuum torr gauge, item 103.1006 recommended for pressure verification very 3 months – Required for AASHTO re:source accreditation - HERE CoreLok Bags (Small, Large & Channeled) sold separately HERE 103.1000