Light level max. = 634 Btu/ft² x h, 2000 W/m²
Accuracy max. = ±3 Btu/ft² x h, ±5 W/m²
Resolution = 0.1 W/m², 0.1 Btu/ft² x h
Angular accuracy = <5
Test type = Solar energy
Included = 4 x AAA battery, manual
Battery life = 100 h
Battery type = AAA
Dimensions = 64 x 34 x 110mm
Weight = 158g
Height = 110mm
Operating temperature min = 0°C

Instruction manual, AAA alkaline manganese batteries (x4) and tripod mounting screw. Solar Power Meter RS Pro ISM 400. The RS Pro ISM 400 measures the irradiated and transmitted solar power of a system to determine the optimal positioning and orientation of solar modules. Calculations include total solar energy versus past time or average solar energy per hour. The meter can determine the percentage of solar power transmitted through glass, insulation, and devices such as sunshades. Features and Benefits. Spectral sensitivity: 400-1000 nm Full cosine correction for oblique incidence of sunlight Units selectable W/m 2 or Btu/(ft 2 x h) Modes Measured value storage/MAX./MIN./Average Manual data storage and read functions (99 records) Hour meter Dimensions: 110 x 34 x 64 mm Weight: approx. 158 g. Application fields. Meteorology agriculture Solar radiation measurement Solar energy research Physics and optics laboratories Solar transmission measurement High power time window detection.