This is a magnetic field meter or Gaussmeter which uses a UGN3503 Hall effect device to drive a meter. It shows the magnetic field sensor reading the strength (in Tesla’s) of a small horseshoe magnet. The meter is not yet calibrated so the reading is not correct.
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Using liquid nitrogen with a Peltier effect device to generate a massive 45 mW of power with a temperature differential.
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This green laser pointer from 2010 above is a class IIIa 532 nm diode laser rated at 5 mW and is legal in the USA.
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