It means you had a high temp of 97/98 and a low of 65/65.So maybe I don't understand what the high and low's actually mean. Mine seems accurate enough, but when I cycle it to the high and low ends, it seems like useless information. What exactly does this information MEAN?
Some thermometer/hydrometers don't hold that info for long... Others (mine) keep it until they manually get reset... I find it useful information... In particular the lowest temp and highest humidity. As those usually occur during lights out.