M40 is an accessory for BESFUL controllers BF-DKT4, BF-M170G, and BF-170MW. After the multi-pin probe cable immersed in the tank is connected through the M40, it becomes a two-core signal cable that connects to the controller's water-level terminals. (Built-in resistor network with a total resistance of 60K, compatible with the water-level resistance networks of most solar controllers on the market.)
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