Mini-indicator verticale waterniveausensor roestvrijstalen vlotterschakelaar

In general, the device is good. But unfortunately the contacts are normally closed. Here is the instructions how to make its contacts normally opened. First use heat gun and long strong needle to take out all insides from tube. Second, use other reed switch (i found one in the household inside the glass break sensor, but you can just buy it) place it in the heat shrink tubing and find its position inside the metal tube so that the contacts are normally open when the magnetic float is in the down position and normally closed when the float rises. Then, use a good sealant to seal the hole and to hold the reed switch in correct position inside the tube.

Does what it's supposed to do, but unfortunately the length to be selected is not the same as the working length. Accordingly, only deeper installation is possible. Still sufficient for my purposes.

This part works extremely well. You just have to be careful not to overdo the electrical load so that the small reed switch doesn't burn up.

The product is used so that the ends of the cables are badly peeled and the cables are black with stains, but it works well.