... Meter SM206 Range: 0.1-399.9 w/m2 1-3999 w/m2, 0.1-399.9 Btu,1- ... .,Ltd (A1) Range: 0.1-399.9 W/m², 1-3999 W/m², 0.1-399.9 Btu/(ft²-h), 1 ... -3999 Btu/(ft²-h)Resolution: 0.1W/m², 0 ... or ±5% of the measured valueTemperature error: ±0.38W/m² / °C [ ±0.12 Btu/(ft²-h)/°C] deviation ... C <70%RHDimensions and weight: 132(L) x 60(W) x 38 (H)mm Weight: approx 150gBattery needed: ...