A continuity tester, aka test light.
Its a simple ohmmeter with a go/no-go indicator (often a light bulb).
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A multimeter is commonly used to measure continuity in electrical circuits. It can test for the presence of a complete path for electrical current flow between two points.
An instrument that measures heat and cold is called a thermometer.
A thermometer is an instrument that measures hot and cold temperatures. It typically uses a liquid, such as mercury or alcohol, to gauge the level of heat or coldness in its surroundings.
A voltmeter is the instrument that measures electric potential. It is typically connected in parallel to the circuit or component being measured to determine the voltage difference between two points.
A calorimeter is an instrument that measures the amount of heat energy stored in a substance by determining the temperature change during a chemical reaction or physical process.
A pyrometer is an instrument that measures very high temperatures, typically using infrared radiation to determine the heat emitted by an object. These devices are commonly used in industrial settings, such as in foundries, kilns, and furnaces, where traditional thermometers would be impractical or inaccurate.