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Richard a klein thermometer vintage

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All thermometers work on the principle of detecting changes in the physical properties of things as temperature changes. As early as BC, Philo of Byzantium noted the expansion and contraction of air with hot and cold. By the 16th and 17th centuries AD, European scientists had used this principle to create the earliest thermal instruments by trapping air in glass tubes that were closed at one end and submerged in water at the other. These early "thermoscopes," as they were called, displayed the rise and fall of the water line relative to the contraction and expansion of the air trapped inside the tube. The Venetian physician Santorio Santorio is credited with being the first to put measured markings with a numerical scale on the sides of one of these air "thermoscopes," effectively creating the first thermometer.
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Klein Tools Infrared Thermometer

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Richard Kline - Biography - IMDb

Klein Tools has a new infrared thermometer rolling out with an eye on value without giving up the accuracy of a dual laser system. The Klein IR5 features a distance to spot ratio, keeping it in line with the kind of distances and spaces electricians tend to work in. These include maximum temperature, average temperature, temperature difference, and minimum temperature measured. User comfort considerations include a backlight and soft touch overmold. The Klein IR5 has been drop tested to 6. The IR5 uses a single 9-volt battery that will stand up to roughly 10 hours of continuous use, including keeping the backlight on. Most importantly to the new electrician or electrical tradesman is the price point.
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Seven Old Thermometers...from "1937" to "1960's"

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