We have added the type Si-RS485TC-3T-MB to our well known digital Silicon irradiance sensors. The Si-RS485TC-3T-MB has two connectors for external temperature sensors. With this you can measure beside the solar irradiance also for example the PV module (Tmodul-Si) and the ambient temperature (Tamb-Si). Alternative also two module temperature sensors Tmodul-Si could be connected. The connectors have numbers, so the measured values can easily be identified.