I bought a Kestrel 5000 environmental meter to provide accurate local readings for a portable astronomical observatory. It was worth the investment as it allows me to record accurate readings of key environmental conditions relevant to visual observations, allowing me to get the most out of future observations, and the barometer and hygrometer combo certainly helps in predicting locations. Plus, the red backlight ensures I don't mess up my dark adaptation. Adding a weather vane mount will certainly help as both wind direction and speed can be measured.
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