We are using the IEC 61010 harmonized standard to certify to the Low Voltage directive. I have two questions about items in the standard and would like to get the community's input on them. 1) IEC 61010-1 refers to altitude above 2000 m. Is this for instruments to be used in flight, or does it also refer to elevations more than 2000 m above sea level? 2) IEC 61010-1 refers to clearance and creepage distances as the "shortest distance" with a typical minimum being 0.5 mm. When measuring minimum distances, is it acceptable to round to the nearest 0.1 mm?