P3Y4R1H4E1L1I1O1M3E1T1E1R1
23 points
PYRHELIOMETER is validvalid
a device that measures direct beam solar irradiance [n PYRHELIOMETERS]
an instrument for measuring the heating effect of the sun [n -S]
a device that measures direct beam solar irradiance [n PYRHELIOMETERS]
an instrument for measuring the heating effect of the sun [n -S]