Hydros terminator photo

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Why are there two different photos of two different types of terminators for hydros, one with a plastic rubber wrap around the end, and another with just a blue stick on the end. Are there two different models?
 
Tidal Gardens
I believe it's just a different casing, the body looks the same. I have this one.

1768719472500.png
 
They all have the same value resistor added between the same pins.
 
Avast

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