Index finger and tongue
Meteorologist usually use the index finger to measure the wind by wetting it with the saliva (using the tongue) and held it up to the air. The coldest part of the wet finger indicated from where the wind blew.
On the other hand, oceanographer usually use index finger to measure salinity of sea water by dipping the index finger into sea water and licking it (using the tongue). More salty the finger, higher its salinity.
So, the different convention is: meteorologist made use of the index finger as a sensor and the tongue as a tool to make the sensor works, whereas oceanographer made use of the tongue as the sensor and the index finger as a tool to take the water sample.
Does this different convention become a problem for them? Of course not! after completing the measurement, they had lunch together and made use of their tongue to taste the meals :)