PQS 1 Quantum Sensor for Photosynthetically Active Radiation. Spectral range 400-700nm, response time 1ss, non-linearity 1%, directional error 3% (at 80 solar zenith angle), sensitivity 4 - 10V/mol/sm, operating temperature -30C to +70C. Photo-diode detector, diffuser and optical interference filter, mV output and standard captive cable of 5m length. ...