MSP430FR6043: Suggested Transducers for MSP430FR6043

Hi Soorej, the transducers on your picture are typically used for distance measurement in dry environment and ultrasonic remote control.  (all Air applications)

Transducers for gas you find if you type on google "transducer gas 200kHz" or "transducer gas 500kHz". Transducers for liquids you find with "transducer water 1MHz" . Any other modifications with the search string would work too. You will see that those transducers a have a rigid body and flanges to hold gaskets;  other than those you showed.

Many of the transducer providers you could find so far also offer clamp on transducers, some with and others without the mechanical clamps. The clamping mechanisms itself vary depend on the pipe type, wall thickness, roughness, material, etc. . 

If you simply look for "transducer water clamp on" you will find complete meter systems, and not the bare transducers. 

have fun hunting the transducer that suits your needs, there are plenty out there

    Johann