I would say the answer is All of the above
Unexpected means it was something you did not "expect" to happen such as a car crashing into you which means this is wrong.
Unfair is any injury.
Unnecessary means it was never needed and could have been prevented/not done therefore unnecessary is the best term.
When using the ice water bath method, the temperature of a bimetal stemmed or digital thermometer should be calibrated in 32 °F.
A bimetal stemmed thermometer is a type of thermometer used for measuring food temperatures.
It can measure a temperature range from 0 to 220 degrees Fahrenheit °F.
It is called bimetal stemmed because it has a metal stem with a sensor in the lower end.
Bimetal stemmed thermometer are calibrated using the ice water
bath method.
When the metal probe of the thermometer is placed in a bowl filled with ice water, the reading should be 32°F (which is equivalent of 0°C for ice water). This shows that the thermometer is still effective.
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