Using the Clear Sky Calculator to determine PAR meter accuracy.

[@alwan321]

Thanks a lot, greetin' from France.

[@FluffyFerretFarm]

Wow.. can't wait for 8 months to test this😁🤘🏻

[@t.properties6878]

😂 that ending.

[@demonioquantico_666]

Before thinking that your meter is broken or in need of maintenance, make sure the bulb is within its lifespan.