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Thermometer is a device that measures temperature or a temperature gradient. A thermometer has two important elements: (1) a temperature sensor (e.g. the bulb on a mercury-in-glass thermometer) in which some physical change occurs with temperature, and (2) some means of converting this physical change into a numerical value (e.g. the visible scale that is marked on a mercury-in-glass thermometer).
There are various principles by which different thermometers operate. They include the thermal expansion of solids or liquids with temperature, or the change in pressure of a gas on heating or cooling. Radiation-type thermometers measure the infrared energy emitted by an object, allowing measurement of temperature without contact.
Some of the principles of the thermometer were known to Greek philosophers of two thousand years ago; by the 18th century, standardized scales allowed the readings of different thermometers inter-comparable.
. C/F: Centigrade/ Fahrenheit toggle button allows you to choose to view readings in C or F scale. Can be useful but also means if users do not make habit of confirming the scale readout is in, then you can get incorrect readings.
Min/Max: Minimum/Maximum button allows user to see the mum or maximum reading since unit was turned on or since unit was cleared. Some models have this function as you toggle through a feature button.
Hold: As the name says, this button when pressed holds the current reading. Used when taking multiple readings and you need to hold a reading to show to someone else.
K, J, E, T: Allows user to select type of thermocouple in use.
O.1/1: Allows user to select resolution of reading. Even if thermometer is not 0.1 degree accurate display can show this. Switching to 1 degree resolution means faster response instead of waiting for reading to stabilize.
Low Battery Warning: Not a button but a feature of some thermometers to indicate the battery is low and to change it as soon as possible.
Dual Inputs: Some thermometers have dual inputs to allow you to connect 2 different probes at the same time. This is useful for persons doing calibrations and/or checks of their probes or for HVAC applications doing differential temperature readings.
Rubber Boot: Optional or standard accessory with most hand held thermometers. Improves grip and drop shock resistance. Usually include flip out stand to allow thermometer to be placed on counter for readings at angle.
Study of weather