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FreeDSM is a device that allows you to measure the quality of the sky background during your night observations. It is a photometric instrument that incorporates the Osram TSL2591 sensor, with two diodes: one will make a measurement in the infrared range and the other in the full spectrum. From those diods, it provides the mpsas measurements every minute (its range is 12-23 mpsas).
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FreeDSM is a device that allows you to measure the quality of the sky background during your night observations. It is a photometric instrument that incorporates the Osram TSL2591 sensor, with two diodes: one will make a measurement in the infrared range and the other in the full spectrum. From those diods, it provides the mpsas measurements every minute (its range is 12-23 mpsas).
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