HOBO* Water Level Data Logger, low-cost, research-grade water level data logger for continuously measuring water level and temperature in a wide range of underwater environments, 0.1% measurement accuracy, Depths up to 13 feet
Photosynthetically Active Radiation Sensor, measures photosynthetic light levels in both air and water, features a waterproof sensor head and can be used to measure PPFD from sunlight and electric light sources
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