Abstract: A measuring appliance (6), having a holding apparatus (10) of variable length, on which an image recording apparatus (9) is arranged at the distal end for the purposes of recording images of an object to be surveyed (1) and at the proximal end (16) of which a display (17) is arranged for real-time presentation of an image from the image recording apparatus (9), wherein an image recording process can be triggered from the proximal end (16) of the holding apparatus.

Abstract: A site measuring device (4) for determining a geometric measurement variable of an object (1) based on a three-dimensional model (11) which is stored in a model memory (13) and has a gravity vector (g). The site measuring device (4) has a marking unit (14) that marks a first feature (P0) and a second feature (P1) in the model (11) and a fitting unit (15) that determines a first auxiliary geometry (L0), which contains at least the first marked point feature (P0) and extends parallel to the gravity vector (g), and determines a second auxiliary geometry (E1), which contains at least the second marked feature (P1) and extends perpendicular to the gravity vector (g) and for forming the point of intersection (P2) of the auxiliary geometries (L0, E1). A calculation unit (17) calculates the geometric measurement variable with the aid of the point of intersection (P2).