solar film transmittance meter adopts parallel light path design which is very suitable for optical properties testing of automotive films, explosion-proof films, architectural films, thermal insulation films,film glass and other materials.It can measure UVR,IRR,VLT at the same time , and S1ProMax model also can measure SHGC/TSER,SIRR. The large-screen LCD screen display and large test slot,easy to use it.