Ensure glass is very clean before attaching suction cup. Glass can be cleaned safely with white vinegar. Attach the suction cup above the water line as this prevents it from going hard.
It works best when not completely underwater, have some of the bare titanium rod partially above the water surface.
It is very important that the probe is plugged into a grounded outlet, such as a standard wall plug.
We recommended using it in conjunction with an RCD adaptor for added safety. You can get these on ebay or Amazon for about £10
If you have a sump but your probe is in the main tank and you are still feeling stray voltage in your sump then your waterflow between the tank and the sump is too weak/slow and there will be breaks/gaps in the waterflow inside your piping/tubes. To resolve this you will have to move the probe from the main tank to the sump temporarily, or increase the water flow from tank to sump, or purchase a second probe.
