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Duotone panel — violet briefing on the left, lime-sealed detail sheet on the right.
4 Channel 5V Relay Board Module Relay Expansion Board For Arduino Raspberry Arduino LilyPad ATmega328P compatible Board estimate CO2 levels estimate CO2 levels Its compact form factor and front panel controls make it suitable for both laboratory benches and field service applications where space is limited 4 Channel 5V Relay Board Module Relay Expansion Board For Arduino Raspberry
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