Until it beeps.
Depending on the intensity of the light the thermometer should indicate an increase in temperature.
You should place is along the wall.
Place it in ice water. It should read 32°.
Out of the hands of children, in a place protected from mechanical shock and away from extremes of temperature that could exceed the range of the thermometer.
place on forehead for 4 minuites and you should get a accurate reading.
32
So you can make sure the fish has a suitable temperature
In the center of the the refrigerator
It doesn't A thermometer doesn't keep your home at a certain temp. a thermometer tells the temp. of a place.
There are several good places where a person can place a room thermometer so it will give an accurate reading. A person should place it in the middle of the room in the center of their home. Also, make sure it isn't near a window, door or heater, all which can affect the reading.
When you temporarily leave the dinner table you should always ask to be excused. Also, never place your napkin back on the table, leave it in your chair.
You must hold your mouth closed and keep the thermometer in place for a certain period of time. If you have a digital thermometer, it will tell you when it's "done". If you are using an old "mercury thermometer", the thermometer must stay under the tongue for at least a minute to 2 minutes.NOTE: Mercury thermometers are being phased out. The mercury inside is highly toxic and you should dispose of all mercury thermometers by taking them to a recycling center that handles that. DO NOT THROW IT IN THE TRASH. Mercury is poisonous to every living thing.UPDATE: GERATHERM offers MERCURY FREE thermometers that work the same as the mercury ones. They are supposed to be safe.