Here is a shot of mine, mounted on an EV2.
The wheel is set at about 19 yards in the photo. You can see the 20 to 55 yard marks at 5 yard intervals above the little piece of credit card that formed the indicator. You may also see some other marks on the left hand side of the wheel, and they are close distances with the 50ft adaptor in place.
This is the standard wheel that was supplied at the time. T50s also come with a bigger (127mm) wheel as part of the package. Both the T35 and the T50 need a 44mm core in the big wheel.