The Planted Tank Forum - View Single Post - Cheapest PAR Meter DIY
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post #5 of (permalink) Old 12-25-2013, 04:21 AM Thread Starter
Planted Tank Guru
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No buttons to operate except the on-off-hold switch, which you only use to turn it on before sticking it in the water. The problem would be the trapped air in the bag would make it hard to push it down to the substrate, and your hands and arms would interfere with the light. Sealing the sensor would only be hard once, not every time you try to use it.

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