Abstract: An electronic measuring wheel has a casing, a distance wheel and an operating shaft. The casing has a power supply, a seven-segment display and a sensor. The seven-segment display is mounted in the casing and is electrically connected to the power supply. The sensor is mounted on the seven-segment display in the casing and is electrically connected to the power supply and the seven-segment display. The distance wheel is rotatably connected to the casing and has a distance wheel axle and an induction ring. The distance wheel axle has an inner end mounted in the casing. The induction ring is mounted around the inner end of the distance wheel axle near the sensor. The operating shaft is connected to the casing.

Abstract: An electronic measuring wheel has a casing, a distance wheel and an operating shaft. The casing has a power supply, a seven-segment display and a sensor. The seven-segment display is mounted in the casing and is electrically connected to the power supply. The sensor is mounted on the seven-segment display in the casing and is electrically connected to the power supply and the seven-segment display. The distance wheel is rotatably connected to the casing and has a distance wheel axle and an induction ring. The distance wheel axle has an inner end mounted in the casing. The induction ring is mounted around the inner end of the distance wheel axle near the sensor.

Abstract: A foldable measuring device includes a number of segments pivotally connected together with pivot axles, one segment includes a recess and an aperture for receiving a pivot axle, the other segment includes a protrusion for engaging with the recess of the other segment and includes an orifice for receiving the pivot axle, a spring biasing member is engaged into the other segment and engaged with the pivot axle for biasing the segments toward each other, and a cover segment is attached to the other segment for covering and shielding and protecting the spring biasing member, and for preventing the spring biasing member from being exposed and damaged by the other segment.

Abstract: A wheeled distance measuring device includes a housing attached to a pole, a counter attached to the housing and having a spindle extended out of the housing, and two gear members of different diameters selectively attached to the spindle, a wheel including a wheel axle attached to the housing, a carrier adjustably attached to the housing, a gear element rotatably attached to the carrier for selectively engaging with either of the gear members, and a gear coupling mechanism coupled between the wheel axle and the gear element for allowing the gear element to be rotated by the wheel axle to rotate either of the gear members and for forming either a metric or a British scale or unit or system.