Today I borrowed a DrDaQ logger and tried to install the latest software. On laptops it impossible to install the software, I had to switch to a desktop. The scop programm makes my mouse movements very slow and inaccurate. Futhermore the registration of temperature (external device) is slow and not correct (I expect icewater to be 0 celcius), so how can I calibrate this? The same question for pH. And can I read the pH in terms potential? OK, a lot of question, but before I buy a lot of these things I must be sure they can do the job.