Yes, they do or you can buy one already recalibrated directly from them. It then reads from 0.7V to 1.0V with each LED representing 0.1V increments so you can fine tune your A/F ratio more accurately. From Autometer each LED represents 0.5V so the last 3 LED's are the only real useful ones and then that's innaccurate in itself as there is a world of difference between 0.90V and 0.95V for example - especially when you are looking to hit 0.92V at WOT for max power (safely) on the SVT.
