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Solarimeter SL 100.
Technical specifications
Range
1...1300 W/m2
Counter
1...500 Wh/m2
Functions
Actual, average, min./max., hold
Display
With backlight, variable contrast
Sensor
External, 1.25m cable
Supply
3 AAA batteries
More on solarimeter SL 100 on Sauermann website [EN]
SL 100 datasheet [EN]