Well that's terribly discouraging news. Not much good as a Alk monitor if it can only record it once a day....Just one time or if you ever drain the unit .... also remember the unit must measure at least once every 3 days in order to keep the PH probe wet or it will drift off. And it is to my understanding that if you are using it with just a stand alone unit and not a P4 and only having it monitor like I am at the moment, your wasting reagent if you are measuring more than once a day. At the moment until firmware updates it is not keeping a log. So if your only monitoring measurement readings you are only able to see the last one taken and you will not have access to prior daily readings. Just set it to measure once a day and if you want twice then do the second one manually after you read the prior one for the day.....