Which tool does not belong anemometer barometer thermometer or seismograph and why?

Answer 1

Carefully convoluted thinking can make any of the equipment mentioned the same or different from any or all of the other options. As examples:

• all of them measure change in physical factors
  
• none of them measure sound levels
  
• anemometers and seismographs both measure physical movement,
  
• anemometers and barometers both deal with air,
  
• barometers and thermometers can both contain a Mercury filled tubes
  

The most likely odd man out is seismograph as it does not provide weather information

Answer 2

seismograph