The MP-303S Load Selector (MTI.AWS.EK.303S) with improved measurement ranges for voltage, current and power over the standard MP-303 provides x6 channels for measuring the IV curves of connected PV modules in combination with the MP-165 I-V Tracer and can be kept at MPPT conditions with an optional load. The optional load can be a passive load, an electronic load or power optimiser that is connected to the inverter and grid. In total x8 units of the MP-303X can be connected to one MP-165.