Geomaster/China manufactures and supplies a full range of Distance Measuring Equipment listed below---Distance Measuring Equipment -Laser Distance Meter: DistomasterTM -Electronic Distance Meter (EDM) -Ultrasonic Distance Meter (Range Finder) -Counter (Hand Tally) -Length Measuring Wheel (LMW) -Distance Measuring Wheel (DMW) -Fiberglass Measuring Tape -Steel Measuring Tape Here are the details of DMW----Distance Measuring Wheel (DMW) --Measuring Wheel DMW-21A, DMW-21B DMW-21C DMW-21D-1M, DMW-21D-2M, DMW-21D-3M, DMW-21D-4M DMW-21D-1F, DMW-21D-2F, DMW-21D-3F, DMW-21D-4F DMW-21E DMW-21F1, DMW-21F2 DMW-21H-1M, DMW-21H-1F DMW-21J, DMW-21K --Digital Measuring Wheel DMW-21G DMW-08A099 DMW-08B100 DMW-08C318