Abstract: A caliper-like instrument for measuring tree diameters, includes a straightedge on which there is placed a first leg and a second leg. The instrument further includes a recording unit adjacent the first leg for recording and storing tree diameter measurements. The first leg is fixedly placed along the straightedge, and the second leg projects out from a slide displaceable along the straightedge, with the legs and the straightedge located in mutually the same plane. The first leg can be lowered in the plane and is pivotally fastened to an attachment on the straightedge, and the second leg can be lowered in the plane and is pivotally attached to the slide. The first leg has a first fastener intended to be hooked into the attachment and the second leg has a second fastener intended to be hooked into the slide.

Abstract: An electronic measuring tape that includes a roller onto which the measuring tape is arranged to be wound up onto and wound out from through the roller being rotated, a first end of the measuring tape is attached in the roller, and where the roller is located inside a housing. A rolled up measuring tape is arranged in loops on the roller. All loops are in direct contact with the surface of the roller, an angle sensor is arranged at the roller to record an angle of rotation during rotation of the roller. An electronic circuit converts the angle of rotation into a length that corresponds to the length by which the measuring tape has been withdrawn from the housing, and the measuring tape records absolute values.

Abstract: A hand-carried counting device with which a counter is stepped forwards through one increment in response to the depression of a count key. The counting device is electronic and includes at least three different count keys for counting the numbers of three mutually different objects. Depressing a count key causes an electric signal to be sent to a register associated with a microprocessor, or the like, within the device. The register corresponds with the key that has been depressed. The device includes a function key which when depressed once or repeatedly causes the microprocessor to perform at least the function that causes the current count values in the various registers to be shown on a display carried by the device. At least one count key is operatively coupled with each of two count registers that are not coupled with another count key.