NO-SLIP toothed wheel made of sintered iron keeps sure contact with cordage. NO-SAG guide trough controls cordage travel in/out. Accurately measures cordage from 5/32" to 3/4" diam. Easy feed-through because you can see and reach cordage running under polished stainless steel pressure shoe. ANALOG COUNTER indicates feet and inches to 999’11” and starts over. Also subtracts. FAST RESET: one knob returns all numbers to zero.