Specification: JPC-242 JPC-242A JPC-242B Wavelength range: 200nm-800nm 330-800nm 200nm-800nm Light source: Tungsten-halogen lamp 12v 30w Tungsten-halogen lamp (12V/35W),Deuterium Lamp(DD-2.5A) Wavelength accuracy: ?nm ?nm Spectral band: 6nm 6nm 2nm Stray lights: ≤0.6% (220nm) 1%(T) (at 360nm) ≤1%(T) (360nm) Stability: a light currency 0.5%(T)/3min b dark currency 0.2%(T)/3min a) Dark current ≤0.3%/3min(t) b) Light current ≤0.5%/3min(t) c) Voltage ≤11%(220?2v) Transmittance range: 0.0%-110.0%(T) 0-100%(T) Absorbance range: 0-3.000(A) 0-2.000(A) Concentration display range: 0.000-9999(C) T-A conversion accuracy: ?.002(A) ?.002A(at 0.5A) ?.004A(at 1 A) ≤10.004A(at 0.5A) Drift: 0.005A (1h) Display mode: Wavelength-4-LED digit display Data-4-LED digit display Power: 220V?2V 50Hz?Hz