I have an old crock pot with Low- High and Off setting!
What is the temp. when it is on Low all night, or when it is on High?
Thinking about getting an updated one that is digital and you can set the temp.
I found the following on Wikipedia, Rosie. Hope it's of some help to you. FWIW, both of my CrockPots are Non-Digital and maintain a pretty even temperature.
Many slow cookers have two or more temperature settings (e.g., low, medium, high, and sometimes a "keep warm" setting). A typical slow cooker operates at approximately 160°F on low, to perhaps 190-200°F on high, and 1 hour on high followed by an indefinite time at medium heat. In any case the cooking temperature is below the boiling point of water (212F / 100C). Some slow cookers sold in the US in the past several decades did not slow cook at all: all of the settings brought the contents to full heat, with the only difference in setting being the amount of time needed. This may have been due to concerns about product liability from unsafe food holding temperatures.
© RDA Enthusiast Brands, LLC 2014