Water bath

Greetings to everyone,

I have a water bath in the prep that has an analogue control with a spring in it which doesn't leave me to lock it to Max (100 Celsius) position,

Is this for safety reasons? If I need to reach the maximum temperature what I am supposed to do? Standing there and hold it?

Furthermore it is very slow when it comes to achieving relatively not so high temperatures like e.g. 65 oC

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When I need high temperatures (eg 65C), I start it off by using either the hottest water from the tap (ours is about 50-60C) or boiling water from the kettle. If I use the kettle, I put a bit of cold in first then add boiling water till I get to the correct temperature.