It says in the description, that it is “above the table height adjustable”. How does this work, with the bases that are included?

Hello Larry Thank you for your contact. We apologize for any trouble or inconvenience in finding information. in order to do a depth cut adjustment on the router, you would follow the following steps. 1. Select and install the desired bit. 2. Place the router on its base on the work piece. 3. Open the locking lever and turn the depth adjustment ring (B) until the bit just touches the work piece. Turning the ring clockwise raises the cutting head while turning it counterclockwise lowers the cutting head. 4. Move the adjustable scale clockwise so that 0 on the scale is located exactly above the pointer (Z) on the base. 5. Turn the depth adjustment ring along with the adjustable scale to the desired depth. Note that each mark on the adjustable scale represents a depth change of 1/64" or .015" (0.4 mm). 6. Close the locking lever Best Regards Sherri C DEWALT