Must be able to store data for later download via Wi-Fi, or USB connection to computer or tablet.
larymau gweledol a/neu glywedol sy’n gywir i blws neu finws 40ppm neu lai, a gallu storio data i’w lawrlwytho nes ymlaen gan ddefnyddio WiFi neu gysylltiad USB â chyfrifiadur neu lechen.