Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking being supervision, life-saving and teaching apparatus and instruments, namely, apparatus and instruments for controlling, testing, analysing and improving photovoltaic devices, namely, electrical controllers, for use with photovoltaic components, optical inspection apparatus, for use with photovoltaic components; photovoltaic modules and photovoltaic system components, namely, ph...