Vibronic-type sensor, comprising: - a first sensor tube - a second sensor tube, - as well as a holder for electric cables and/or for coils provided on the sensor, said holder comprising - at least a spring-elastic first branch fixed on a first tube of a sensor, and - at least a spring-elastic second branch fixed on a second tube of the sensor; - wherein the two sensor tubes (211, 212) -- form a double tube arrangement with a longitudinal gravity line, which is located on a median plane extending in an imaginary manner between the two sensor tubes (211, 212), particularly being parallel to one another, -- and are designed to be excited, during the operation of the sensor, to produce mechanical vibrations in a useful mode in such a way that they at least temporarily vibrate essentially in antiphase to one another; - and wherein the two branches (15A, 15B) of the holder are interconnected, particularly in an essentially rigid manner, at a connection point at a distance from the two sensor tubes (211, 212), in such a way -- that the holder has a first normal mode with a mechanical resonance frequency at which the first branch fixed on the first sensor tube and the second branch fixed on the second sensor tube oscillate in a manner that is essentially perpendicular to the median plane of the double tube arrangement, -- and in that the holder has a second normal mode of a predefined mechanical resonance frequency at which the first branch fixed on the first sensor tube and the second branch fixed on the second sensor tube oscillate in a manner that is essentially parallel to the median plane of the double tube arrangement; characterized in that - the resonance frequency, f 1, of the first normal mode of the holder is different from the resonance frequency, f 2, of the second normal mode of the holder, - and in that the resonance frequency of the first normal mode of the holder is less than a lowest mechanical resonance frequency of the sensor tubes (211, 212) vibrating in the useful mode, particularly by 10% or more. - a first sensor tube - a second sensor tube, - as well as a holder for electric cables and/or for coils provided on the sensor, said holder comprising - at least a spring-elastic first branch fixed on a first tube of a sensor, and - at least a spring-elastic second branch fixed on a second tube of the sensor; - wherein the two sensor tubes (211, 212) -- form a double tube arrangement with a longitudinal gravity line, which is located on a median plane extending in an imaginary manner between the two sensor tubes (211, 212), particularly being parallel to one another, -- and are designed to be excited, during the operation of the sensor, to produce mechanical vibrations in a useful mode in such a way that they at least temporarily vibrate essentially in antiphase to one another; -- form a double tube arrangement with a longitudinal gravity line, which is located on a median plane extending in an imaginary manner between the two sensor tubes (211, 212), particularly being parallel to one another, -- and are designed to be excited, during the operation of the sensor, to produce mechanical vibrations in a useful mode in such a way that they at least temporarily vibrate essentially in antiphase to one another; - and wherein the two branches (15A, 15B) of the holder are interconnected, particularly in an essentially rigid manner, at a connection point at a distance from the two sensor tubes (211, 212), in such a way -- that the holder has a first normal mode with a mechanical resonance frequency at which the first branch fixed on the first sensor tube and the second branch fixed on the second sensor tube oscillate in a manner that is essentially perpendicular to the median plane of the double tube arrangement, -- and in that the holder has a second normal mode of a predefined mechanical resonance frequency at which the first branch fixed on the first sensor tube and the second branch fixed on the second sensor tube oscillate in a manner that is essentially parallel to the median plane of the double tube arrangement; characterized in that - the resonance frequency, f 1, of the first normal mode of the holder is different from the resonance frequency, f 2, of the second normal mode of the holder, - and in that the resonance frequency of the first normal mode of the holder is less than a lowest mechanical resonance frequency of the sensor tubes (211, 212) vibrating in the useful mode, particularly by 10% or more. -- that the holder has a first normal mode with a mechanical resonance frequency at which the first branch fixed on the first sensor tube and the second branch fixed on the second sensor tube oscillate in a manner that is essentially perpendicular to the median plane of the double tube arrangement, -- and in that the holder has a second normal mode of a predefined mechanical resonance frequency at which the first branch fixed on the first sensor tube and the second branch fixed on the second sensor tube oscillate in a manner that is essentially parallel to the median plane of the double tube arrangement; - the resonance frequency, f 1, of the first normal mode of the holder is different from the resonance frequency, f 2, of the second normal mode of the holder, - and in that the resonance frequency of the first normal mode of the holder is less than a lowest mechanical resonance frequency of the sensor tubes (211, 212) vibrating in the useful mode, particularly by 10% or more.