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2. Aquarium heater - Wikipedia

   en.wikipedia.org/wiki/Aquarium_heater

   A typical glass-tube immersion style aquarium heater. An aquarium heater is a device used in the fishkeeping hobby to warm the temperature of water in aquariums. [1] Most tropical freshwater and marine aquariums are maintained at temperatures that range from 22 to 30 °C (72 to 86 °F).

3. Liquid crystal thermometer - Wikipedia

   en.wikipedia.org/wiki/Liquid_crystal_thermometer

   Liquid crystal thermometers portray temperatures as colors and can be used to follow temperature changes caused by heat flow. They can be used to observe that heat flows by conduction, convection, and radiation. In medical applications, liquid crystal thermometers may be used to read body temperature by placing them against the forehead.

4. Thermometer - Wikipedia

   en.wikipedia.org/wiki/Thermometer

   Thermometers are used in roadways in cold weather climates to help determine if icing conditions exist. Indoors, thermistors are used in climate control systems such as air conditioners, freezers, heaters, refrigerators, and water heaters. [56] Galileo thermometers are used to measure indoor air temperature, due to their limited measurement range.

5. Fluke Corporation - Wikipedia

   en.wikipedia.org/wiki/Fluke_Corporation

   Fluke Corporation is an American manufacturer of industrial test, measurement, and diagnostic equipment, including electronic test equipment. It was started in 1948 by John Fluke while he was employed at General Electric .

6. Walmart is replacing its price labels with digital screens ...

   www.aol.com/finance/walmart-replacing-price...

   Digital shelf labels will lessen the burden of updating prices on 120,000 items at Walmart stores. Walmart is replacing its price labels with digital screens—but the company swears it won’t ...

7. pH meter - Wikipedia

   en.wikipedia.org/wiki/PH_meter

   Beckman Model M pH Meter, 1937 [1] Beckman model 72 pH meter, 1960 781 pH/Ion Meter pH meter by Metrohm. A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2]