06034 Rain gauge is set to register 0.01" of rain for every tip of the bucket. My units as delivered was 15% off. Calibration is required! However, if one selects metric units, the rain is displayed at my acurite app only to the nearest mm. This is 4 times worse resolution than in imperial units, making the rain gauge unusable in this mode. This is a problem with the programming of the app at www.myacurite.com. Please ask your programmer to fix this. Users beware! Do not use metric units until this problem is fixed!