for PI640i (calibrated for -20-100 °C (-4 °F ... 212 °F) / 0-250 °C (32 °F ... 482 °F) / (20)150-900 °C (392 ... 2732 °F))
and for PI640i G7 (calibrated for 150-900 °C (392 ... 2732 °F) / 200-1500 °C (302 ... 1652 °F))
15° x 11° lens/ f=41,5 mm (f = 1.6 in)