Module for measuring purposes

A module for measuring purposes, comprising an electrical or electronic circuit having at least one power supply connection and at least one data line connection, wherein said module is adapted to be joined with at least one other module of the same type in the manner of a bus, and:

• wherein said electronic circuit (80) is arranged in a housing having a first contact surface (90) and a second contact surface (91), wherein the first contact surface (90) can be connected with the second contact surface (91) of the other module (22, 32, 42), in a mechanically detachable manner;
• wherein the at least one power supply connection always has a power supply contact (84a, 85a) in the first contact surface (90) and a corresponding power supply contact (84b, 85b) in the second contact surface (91) and the at least one data line connection always has a data line contact (86a, 87a) in the first contact surface (90) and a corresponding data line contact (86b, 87b) in the second contact surface (91);
• wherein in the joined state the power supply contact (84a, 85a) in the first contact surface (90) is in electrical connection with the corresponding power supply contact (84b, 85b) in the second contact surface (91) of the other module (22, 32, 42) and the data line contact (86a, 87a) of the first contact surface (90) is in electrical connection with the corresponding data line contact (86b, 87b) in the second contact surface (91) of the other module (22, 32, 42);
• and
• wherein at least one contact (84a, 85a, 86a, 87a) of the first contact surface (90) is a contact head (70) with a contact surface (72), said contact head (70) located in a recess (75) of said first contact surface (90), and wherein the corresponding contact (84b′, 85b′, 86b′, 87b′) of the second contact surface (91) is a contact tappet (60) guided so that it can be moved essentially perpendicularly to contact surface (91) against the force of a spring (81).