Introduced in the 1960's the Measure Master® Commercial Series was designed to handle the needs of professionals and homeowners alike. While maintaining Rolatape's focus on quality and accuracy, the Measure Master® Commercial Series features an axle driven counter that adds in forward and subtracts in reverse. The Measure Master® Commercial Series is priced right with quality that beats the competition.MM-12 TWIN SERIES Stability and accuracy come together in the MM-12 Twin Series. The MM-12 Twin adds an additional wheel for greater stability and traction. Real estate agents, law enforcement officers, construction workers and contractors rely on the accuracy and balance of the MM-12 Twin.