Device for adjusting the height of a first part relative to a second part, a retrofit kit for such a device and height-adjustable system comprising a plurality of such devices

A height-adjustable system comprising:

• at least a first part;
• at least a second part height-adjustable relative to the first part;
• at least one device for height adjustment of the at least the first part in each case relative to the at least the second part in each case, the at least one device comprising a first hollow profiled element, a second hollow profiled element, a drive unit for displacement of the second hollow profiled element relative to the first hollow profiled element and a support unit for supporting the first hollow profiled element against the second hollow profiled element, the second hollow profiled element comprising a second hollow profiled element longitudinal axis, the second hollow profiled element being displaceable along the second hollow profiled element longitudinal axis relative to the first hollow profiled element, the support unit being arranged between the first hollow profiled element and the second hollow profiled element relative to the second hollow profiled element longitudinal axis, wherein the first hollow profiled element of the at least one device is connected to the first part, wherein the second hollow profiled element of the at least one device is connected to the second part.