The remote unit HT Instruments SOLAR03 has been designed to measure irradiance [W/m2] and temperature [°C] both on Monofacial and Bifacial photovoltaic modules by means of the relevant probes connected to it, and to take measurement of tilt angle of PV panels. The unit has been designed for use in combination with a Master instrument, to carry out measurements and recordings during maintenance operations on photovoltaic installations. The unit can be connected to the following Master instruments and accessories - PVCHECKs-PRO, HT305, PT305.