Device for checking dimensions of a mechanical piece including: - a stationary support (2;22,34;43,47;62), - a movable support (4,6;26,28;42,46,46';64,67) which is connected to the stationary support (2;22,34;43,47;62) and carries at least one feeler (5;29;51;66) adapted to contact the mechanical piece and to perform a displacement, the movable support (4,6;26,28;42,46,46';64,67) being adapted to perform a movement with respect to the stationary support (2;22,34;43,47;62) as a result of the displacement of the feeler (5;29;51;66); - a couple of transducers including each a first part (7,7';27,27';44,44';69,69') fixed to one of said stationary support (2;22,34;43,47;62) and movable support (4,6;26,28;42,46,46';64,67) and a second part (10,10';24,24';45,45';68,68') fixed to the other of said stationary support (2;22,34;43,47;62) and movable support (4,6;26,28;42,46,46';64,67), the first part (7,7';27,27';44,44';69,69') and the second part (10,10';24,24';45,45';68,68') facing each other, and each transducer being adapted to generate a signal indicative of a variation in the distance between the respective first part (7,7';27,27';44,44';69,69') and second part (10,10';24,24';45,45';68,68'), each transducer having a measuring range delimited at least by a maximum distance between the respective first part (7,7';27,27';44,44';69,69') and second part (10,10';24,24';45,45';68,68'); - a processing unit (16;35;52;70) connected to the couple of transducers and adapted to receive the signals generated by said couple of transducers, and to process them to obtain a value indicative of the dimensions of the mechanical piece; characterized in that - said processing unit (16;35;52;70) identifies which of the signals generated by the transducers is included in the measuring range of the respective transducers and is a measuring signal, - said first and second parts of the couple of transducers are arranged at predetermined mutual distances in such a way that said measuring ranges are contiguous, and - the measuring range of the device is substantially larger than the measuring range of each transducer. - a stationary support (2;22,34;43,47;62), - a movable support (4,6;26,28;42,46,46';64,67) which is connected to the stationary support (2;22,34;43,47;62) and carries at least one feeler (5;29;51;66) adapted to contact the mechanical piece and to perform a displacement, the movable support (4,6;26,28;42,46,46';64,67) being adapted to perform a movement with respect to the stationary support (2;22,34;43,47;62) as a result of the displacement of the feeler (5;29;51;66); - a couple of transducers including each a first part (7,7';27,27';44,44';69,69') fixed to one of said stationary support (2;22,34;43,47;62) and movable support (4,6;26,28;42,46,46';64,67) and a second part (10,10';24,24';45,45';68,68') fixed to the other of said stationary support (2;22,34;43,47;62) and movable support (4,6;26,28;42,46,46';64,67), the first part (7,7';27,27';44,44';69,69') and the second part (10,10';24,24';45,45';68,68') facing each other, and each transducer being adapted to generate a signal indicative of a variation in the distance between the respective first part (7,7';27,27';44,44';69,69') and second part (10,10';24,24';45,45';68,68'), each transducer having a measuring range delimited at least by a maximum distance between the respective first part (7,7';27,27';44,44';69,69') and second part (10,10';24,24';45,45';68,68'); - a processing unit (16;35;52;70) connected to the couple of transducers and adapted to receive the signals generated by said couple of transducers, and to process them to obtain a value indicative of the dimensions of the mechanical piece; - said processing unit (16;35;52;70) identifies which of the signals generated by the transducers is included in the measuring range of the respective transducers and is a measuring signal, - said first and second parts of the couple of transducers are arranged at predetermined mutual distances in such a way that said measuring ranges are contiguous, and - the measuring range of the device is substantially larger than the measuring range of each transducer.