The Planted Tank Forum - View Single Post - DIY PAR meter, Yeah you heard me
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post #546 of (permalink) Old 05-09-2013, 04:16 PM Thread Starter
mistergreen
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Join Date: Dec 2006
Location: Cincinnati
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I will make a few this weekend to sell. I checked up on the complaints on the returned meter. It is indeed a calibration problem. The readings are a bit high about (10 - 20 par ) but not 2x, 3x.
It turned out it's more accurate if I calibrate it against a high light rather than a low light value.

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