 We designed an inexpensive, easy-to-use QA device that fits snugly on the mask frame and can be used to perform quick daily checks of the camera. The device consists of a stage, a raised corner, and a post with a reflective marker. Gate blocks are used to set a standard distance and have accuracies of less than 0.4 micrometers. A gate block is inserted in any of the X, Y, or Z directions, and the HDMM system's measured shift is compared against the block thickness. In practice, the procedure takes less than a minute to set up and confirm 1 millimeter shifts for the X, Y, and Z directions.