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Galileo galilei invented a rudimentary water thermometer in which, for the first time allowed temperature variations to be measured (1593)

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Galileo galilei invented a rudimentary water thermometer in which, for the first time allowed temperature variations to be measured (1593)

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The First Thermometers were called Thermoscopes (1593-96)

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The First Thermometers were called Thermoscopes (1593-96)

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In 1593, Galileo Galilei invented the rudimentary thermoscope but the invention was officially completed in 1596.

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Old Romer created the practical thermometer,which used Red Wine as temperature indicator (1593)

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Old Romer created the practical thermometer,which used Red Wine as temperature indicator (1593)

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Santorio was the first inventor to put a numerical scale on the  (1612)

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Santorio was the first inventor to put a numerical scale on the  (1612)

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Daniel Fahrenheit invented the first mercury thermometer (1686 - 1736) 

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Daniel Fahrenheit invented the first mercury thermometer (1686 - 1736) 

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The electrical-resistance thermometer was invented in Germany. It is used to measure (1714)

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The electrical-resistance thermometer was invented in Germany. It is used to measure (1714)

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Daniel Fahrenheit created the first alcohol thermometer (1714 - 1724)

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Daniel Fahrenheit created the first alcohol thermometer (1714 - 1724)

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Daniel Fahrenheit Introduced the temperature scale which bears his name was used on the thermometer (1724)

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Daniel Fahrenheit Introduced the temperature scale which bears his name was used on the thermometer (1724)

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Fahrenheit thermometer

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Andres Celsius introduce his temperature scale which means consisting of or divided into 100 degrees this scale is also known as the "centigrade" scale (1742)

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Andres Celsius introduce his temperature scale which means consisting of or divided into 100 degrees this scale is also known as the "centigrade" scale (1742)

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The term "Celsius" adopted by the interaction conference on weights and measures in Celsius (1742)

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The term "Celsius" adopted by the interaction conference on weights and measures in Celsius (1742)

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Thomas Allbutt invented the first  medical thermometer and was first used on a person in (1866)

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Thomas Allbutt invented the first  medical thermometer and was first used on a person in (1866)

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Lord Kelvin invented the Kelvin scale, which measures extreme temperatures (1848)

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Lord Kelvin invented the Kelvin scale, which measures extreme temperatures (1848)

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Early Thermometers like Galileo's did not have any scales (marking with numbers) to determine precise temperature.

Thermoscopes were the earliest types of thermometers and they only showed changes in temperature but didn't show any scales.

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David Phillips invented the infrared ear thermometer (1901 - 1936)

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David Phillips invented the infrared ear thermometer (1901 - 1936)

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This is the oldest picture I could find of the Infrared thermometer

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Theodore Hannes Benzinger Invented the ear thermometer (1964)

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Theodore Hannes Benzinger Invented the ear thermometer (1964)