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Alnor Illinois Testing Laboratories Inc. Type 2860 temperature gauge
, designed to measure temperatures in Degrees Fahrenheit. This particular device is an example of an analog temperature sensor, specifically an exhaust temperature gauge, capable of measuring a range from 0 to 1000 degrees Fahrenheit.

About Alnor and Temperature Sensors:

Alnor's History: Alnor is a brand with a long history in instrumentation, originally founded in 1919 by John A. Obermaier as Illinois Testing Laboratories, Inc. The company became known for its high-quality instruments, particularly in HVAC and air velocity measurement. The Alnor brand was acquired by TSI Incorporated in 1995, and TSI continues to produce Alnor-branded ventilation test instruments, including thermal anemometers and capture hoods.
Temperature Sensors in General: Temperature sensors, like the Alnor gauge shown, are devices that detect and measure temperature, converting thermal information into a usable output, often electrical or, in this case, a visual reading on a dial.
This Gauge: Alnor gauge is an analog pyrometer, and it weight about 8 pounds.
Significance: Temperature sensors are crucial in a vast array of applications, from everyday items like refrigerators and thermostats to industrial processes, HVAC systems, and scientific research.
This gauge was most likely used in a foundry or to measure exhaust gases.