For detection of modulated laser or other light sources over a wide frequency range. Output is available from two 4mm sockets and through the built in loudspeaker if the modulation is in the audio range. May be used with a modulated laser to detect analogue or digital data including high frequency pulses used to determine the speed of light. Frequency range 100Hz to 5MHz and is powered by a 9V (PP3) battery.
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