An ultrasonic flow meter comprising - a meter housing, - a flow tube defining an inner flow channel for a fluid to be measured, and - one or more ultrasound reflectors (8, 9, 10), said meter housing comprising - a first transducer recess, - a second transducer recess, - a first ultrasound transducer positioned in said first transducer recess, and - a second ultrasound transducer positioned in said second transducer recess, and an electronic circuit for operating said ultrasonic flow meter, wherein said transducer recesses (15, 16) each has slanted bottom walls, and wherein said first and second ultrasound transducers (6, 7) are in abutment with said slanted bottom walls of said first and second transducer recess, respectively, wherein said first transducer has a first ultrasound transmitting surface and said second transducer has a second ultrasound transmitting surface, and wherein said first and second transmitting surfaces have a non-orthogonal orientation with respect to a longitudinal axis of said first and second transducer recess (15, 16), respectively, wherein said ultrasound transducers (6, 7) are positioned inside said meter housing, and wherein at least one of said ultrasound transducers (6, 7) is configured for, during operation of said ultrasonic flow meter, to emit an ultrasound signal, said ultrasound signal propagating through said slanted bottom wall abutting said at least one ultrasound transducer (6, 7), through said fluid in said flow channel, and said ultrasound signal being reflected by said one or more ultrasound reflectors (8, 9, 10), then propagating through said slanted bottom wall abutting the other ultrasound transducer (7, 6) receiving said ultrasound signal, characterized in that the ultrasonic flow meter furthermore comprises a flow channel insert for providing higher flow velocity, in that the flow channel insert is fixated relative to the flow tube by the meter housing, and in that said one or more ultrasound reflectors are fixated in said flow channel insert. - a meter housing, - a flow tube defining an inner flow channel for a fluid to be measured, and - one or more ultrasound reflectors (8, 9, 10), said meter housing comprising - a first transducer recess, - a second transducer recess, - a first ultrasound transducer positioned in said first transducer recess, and - a second ultrasound transducer positioned in said second transducer recess, - a first transducer recess, - a second transducer recess, - a first ultrasound transducer positioned in said first transducer recess, and - a second ultrasound transducer positioned in said second transducer recess, and an electronic circuit for operating said ultrasonic flow meter, wherein said transducer recesses (15, 16) each has slanted bottom walls, and wherein said first and second ultrasound transducers (6, 7) are in abutment with said slanted bottom walls of said first and second transducer recess, respectively, wherein said first transducer has a first ultrasound transmitting surface and said second transducer has a second ultrasound transmitting surface, and wherein said first and second transmitting surfaces have a non-orthogonal orientation with respect to a longitudinal axis of said first and second transducer recess (15, 16), respectively, wherein said ultrasound transducers (6, 7) are positioned inside said meter housing, and wherein at least one of said ultrasound transducers (6, 7) is configured for, during operation of said ultrasonic flow meter, to emit an ultrasound signal, said ultrasound signal propagating through said slanted bottom wall abutting said at least one ultrasound transducer (6, 7), through said fluid in said flow channel, and said ultrasound signal being reflected by said one or more ultrasound reflectors (8, 9, 10), then propagating through said slanted bottom wall abutting the other ultrasound transducer (7, 6) receiving said ultrasound signal, characterized in that the ultrasonic flow meter furthermore comprises a flow channel insert for providing higher flow velocity, in that the flow channel insert is fixated relative to the flow tube by the meter housing, and in that said one or more ultrasound reflectors are fixated in said flow channel insert.