Biodegradable, frost proof heat-transfer fluid, use thereof in near-surface geothermal installations, and a concentrate: subject matter of the present invention is the use of a triazole-free composition which as well as water comprises a) 9. The scale portion includes a display for registering the weight of the person standing thereon. Preferably, the controller stores the light-emission patterns of a display LED for a normal address setting and an erroneous address setting, wherein when normal setting is recognized, the display LED emits light in a normal-setting emission pattern, and when an error is recognized, the display LED emits light in a error-setting emission pattern. A second trench is formed in the n-well, the second trench extending from the surface to a second depth, less than the first depth.