Profile: Handy Geotechnical Instruments, Inc. specializes in geotechnical instruments. Our product line includes borehole shear, pavement permeameter, air jet soil disperser, rock bore hole shear, and Ko stepped blade. The borehole shear tester is used for soil testing. The BST shear head is opened with air or regulated gas pressure, so plates press laterally into the soil. After 15 minutes the shear head is pulled upward. The same procedure then is repeated with progressively higher opening pressures and 5 minute waiting times. Our pavement permeameter measures in-place permeability of exposed base and surface course pavement layers. The pavement permeameter uses compressed air, CO2, or nitrogen. Our gas pressure is adjustable & regulated, with digital readouts for pressure and flow rate.