PCE-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 P_tot in W/m² or BTU/(ft² x h), while the device's auto data memory stores up to 43,000 data sets.

- Measuring 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