I am fairly new to Aida64 so I cannot speak with 100% accuracy but I know that there are sensors that Aida64 cannot read that HWiNFO can. For example I have a new model Corsair cooler and I have not been able to get any info from it except the AIO fan speed. People here have been asking for Corsair cooler support for a long time but the Aida64 devs have said that data is difficult to read, yet HWiNFO can see all my fans. Your flow meter must not be supported yet, if ever.