We have been using the upgraded DV1D arm along with the SuperMax electrometer and software. We love it! The ability to control the scan arm outside the room, script measurements at different depths, and copy/paste the results directly into Excel has significantly reduced the amount of time needed to perform monthly QA and TG-51. It’s like having the functionality of a 3D tank with the setup ease (and cost savings) of a 1D tank!