The HI-300 and HI-330 are fresh concrete moisture testers. By loading fresh concrete (mortar) that has been wet screened on-site into the sample container and simply pressing the measure key, these testers can both easily measure the moisture content and moisture weight of the sample, and output control data to a printer. Further, in addition to measuring the moisture content of fresh concrete, the HI-330 is also capable of measuring the surface moisture of fine aggregate