Decagon Devices SRS Operator's Manual page 9

SRS Sensors
Other Features:
SDI-12 digital sensor, compatible with Decagon's EM50
family and CSI loggers
In-sensor storage of calibration values
Four versions
NDVI-hemispherical
NDVI-field stop
PRI-hemispherical
PRI-field stop
NDVI or PRI sensors with Teflon cosine correcting heads
NDVI or PRI sensors with 20 degree field stops sealed
with clear acrylic
NIST traceable calibration to known spectral radiance or
irradiance values
Sensors can be mounted facing up or down, singly or in
tandem, leveled or aimed
Fully sealed from the elements and UV resistant to mini-
mize drift over time
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2 ABOUT SRS