Name: Visible Spectrophotometer Model: 721 Metering method: transmittance, absorbance Optical system: single beam, 1200 diffraction gratings Wavelength range: 340nm-1000nm Wavelength accuracy: ±2nm Wavelength repeatability: ≤1.0nm Spectral bandwidth: 4nm Luminosity range: 0~100%(T), -0.050~3.000(A) Transmittance accuracy: ±1.0% (T) Repeatability of transmittance: ≤0.5% (T) Stray light: ≤0.5% (T) (360nm, JB400) Light source: tungsten halogen lamp Name: Visible Spectrophotometer Model: 722N/722S Photometric method: transmittance, absorbance, concentration factor, direct reading of concentration Optical system: single beam, 1200 diffraction gratings Wavelength range: 340nm-1000nm Wavelength accuracy: ±2nm Wavelength repeatability: ≤1.0nm Spectral bandwidth: 4nm Luminosity range: 0~100%(T), -0.050~3.000(A) Transmittance accuracy: ±1.0% (T) Repeatability of transmittance: ≤0.5% (T) Setting range: 0-9999 (concentration value or factor) Stray light: ≤0.5% (T) (360nm, JB400) Light source: tungsten halogen lamp Output: RS232 interface/RS232 interface and PC software Instrument characteristics ●Using a new type of single-chip microcomputer system with strong functions, small size and easy maintenance. ●Using flame-retardant, insulated all-plastic shell, exquisite appearance design, convenient operation and high safety factor. ●True 4-digit LCD display, large measurement range and high calculation accuracy.   ●Optical system design, sealed grating monochromator, scientific anti-mildew technology, stray light elimination technology, significantly improve the service life, stray light, stability, and metering accuracy indicators.   ●Precision lamp holder, you can replace the tungsten halogen lamp without adjusting the light path again. ●Automatically adjust 0%, 100% and absorbance 0A.