I have the seneye and it works well enough. Have used a couple others. Honestly, exact PAR values are irrelevant. It does not matter if your lighting produces 90 vs 100 par. A balanced tank will not care. The main concern is knowing the range. Are we talking 20ish par, 50ish, 100ish, 300...? As long as the meter used will get you close (IMO within 20%), it's all you need.
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