A method and a sensing device for feature measurements, for example pressure and / or flow rate and temperature measurements, in a fluid. The sensing device com-prises at least two sensing elements (31,35; 31',35'; 31'',43; 31''',35''',52; 61,62; 86,88; 116,118,120,122) all mounted and / or fabricated on a
chip (20; 30; 40; 81; 112,114) and connected to a
chip circuit, and a power supply and measuring circuit (38) placed outside the
chip (20; 30; 40; 81; 112,114) and connected to the chip circuit. According to the invention the power supply and measuring circuit is controllable to feed at least two different kinds of signalling to the chip circuit. Also according to the invention the at least two sensing elements (31,35; 31',35'; 31'',43; 31''',35''',52; 61,62; 86,88; 116,118,120,122) are connected to each other and to the power supply and measuring circuit such that at least one of the sensing elements (31,35; 31',35'; 31'',43; 31''',35''',52; 61,62; 86,88; 116,118,120,122) independence of the different signalling from the power supply could be individually measured. The chip is adapted to be mounted on a
catheter or a guide wire (28;99; 110).