SPM 1 is a photovoltaic (PV) light meter used to measure solar radiation, solar energy or solar power. The meter's easy-to-read 4-digit LCD screen clearly displays Ptot in W/m² or BTU/(ft² x h), while the device's auto data memory stores up to 43,000 data sets. 

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Solar Radiation Detector SPM 1

  • Measurement range 0 ... 2000 W/m² or 0 ... 634 BTU/(ft² x h)
    Resolution 0.1 W/m² or 0.1 BTU/(ft² x h)
    Accuracy ±10 W/m² or ±3 BTU/(ft² x h) or ±5%; whichever is greatest in sunlight
    Additional temperature induced error ±0.38W/m²/°C or ±0.12 BTU/(ft² x h)/°C from 25°C
    Angular accuracy Cosine corrected < 5% for angles < °60
    Drift <± 2% per year
    Sampling rate 4 times per second
    Detector 1 x silicon photovoltaic sensor
    Internal memory Auto data memory capacity: 43,000 sets
    Manual data memory capacity: 99 sets
    Operating conditions 0 ... +50ºC or +32 ... +122ºF; < 80% RH
    Power supply 4 x AAA Li-ion batteries
    (approx. 16 days of continuous use at full charge)
    Dimensions 111 x 64 x 34 mm or 4.37 x 2.52 x 1.34"
    Weight 158 g / 0.35 lb