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# FreeDSM (Free Dark Sky Meter) # FreeDSM (Free Dark Sky Meter)
## This DIY photometer is part of the project [_Gaia4sustainability_](https://gaia4sustainability.eu/language/en/gaia-4-sustainability/) ## This DIY photometer is part of the project [_Gaia4sustainability_](https://gaia4sustainability.eu/language/en/gaia-4-sustainability/)
<img src="uploads/9c1fcbd76f11ced648335ca94c03ecd0/darksky.png" width="120" height="120"> <img src="uploads/9c1fcbd76f11ced648335ca94c03ecd0/darksky.png" width="200">
![darksky](uploads/9c1fcbd76f11ced648335ca94c03ecd0/darksky.png) ![MICINN](/lia2-publico/g4s/-/wikis/uploads/2cdc984367cdcb81629edcd7a6c6b075/MICINN.png) ![MICINN](/lia2-publico/g4s/-/wikis/uploads/2cdc984367cdcb81629edcd7a6c6b075/MICINN.png)
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). 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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