M 390Calibration source for extremely high temperatures at very quick heat-up time.600 ... 2300°C(type A)600 ... 2600°C(type B)600 ... 3000°C(type C)300 ... 2000°C(type L)600 ... 3000°C(2 piece) Heated emitter shape:Closed end tubeEmissivity:effective = 1.00 at 0.6...1.8 µmeffective = 0.96 at 3...15 µm(For emissivities of other wavelength temperature correction tables are available)Standard calibration method:pyrometricAperture diameter:A, B, C: 16 or 25 mmL: 25 or 38 mmTemperature uncertainty:0.25% of reading +1°CAverage warm-up time:5 min (to 2300°C)Dimensions [mm] (HxWxD) / Weight: 1710 x 560 x 82 / 182 kg