Abstract: In an apparatus for measuring the heart wall movement of a person, including a measuring head (10, 12) placeable on the breast with an electrode arrangement (76, 78) and a measuring circuit (84) for capacitively measuring the skin movement with respect to the electrode arrangement (76, 78), the measuring head has a holding ring (10) with an annular surface perpendicular to the ring axis (26) intended for placement on the body (30, 32) and straps for fastening the measuring head (10, 12) to the body. In the holding ring (10) is an adapter (12) including the electrode arrangement (76, 78) resiliently supported for movement in the direction of the ring axis (26) as well as in two other axes perpendicular to the ring axis and to one another.

Abstract: A device for optically evaluating test strips includes a housing carrying the measuring optics and a test strip holder insertable into and removable from the housing by sliding into and out of a receiving compartment of the housing, with the test strip holder containing all of the surfaces with which the significant portions of test strips come into contact, thereby permitting those surfaces to be easily cleaned upon removal of the test strip holder from the housing. The device also assures proper positioning of an easily inserted test strip, allows for heating of the test field to a fixed temperature, and allows for both empty and dark field calibration of the optical system.

Abstract: The invention concerns a differential-reflectance photometer for quantitatively evaluating test strips, especially for chemical analysis. The differential-reflectance photometer is characterized in that two optical channels are arranged in one housing in V-shaped fashion with each channel receiving an optical emitting and an optical receiving arrangement, that the channels enter a common space at the apex of the V, that a reference field associated with both emitting and receiving arrangement is provided on the bottom of the common space, that the emitting and receiving arrangements are connected to a common evaluation apparatus, and in that between the reference field and the emitting and receiving arrangements is a receiving slot, which intersects both channels, for receiving a test strip with two test fields each of which becomes associated with a respective one of the two channels.