https://www.grainger.com/product/ASSOCIATED-EQUIP-System-Tester-29RW17
This link leads to where the item can be purchased from the manufacturer.
My husband works as a diesel tech at one of the big 3 dealerships, and they just recently received new equipment, so they offered these up to the employees prior to scrapping them. This one has been used no more than 5 times. Perfect condition. Price is negotiable within reason.
