Specifications: Type Photometer filters monohaz Optical system Support circular with 10 filters of interference 345 / 365 / 436 / 470 / 520 / 540 / 585 / 620 / 690 / 800 nm, plus 2 empty positions for additional filters. Wavelength Between 340 - 860 nm Accuracy of the wavelength +/- 2 nm Bandwidth at 50% Transmittance 10 - 12 nm Light source Tungsten lamp Detector Silicon photodiode Screen LCD display 2x16 characters, 8 mm high Operation Bar-code reader. Keyboard covered Modes of operation Concentration, Extinction, Concentration via factor, Calibration of two points, Kinetic Measuring range approx. 3E unsigned Photometric accuracy +/- 1% Stability < 0,002 E/h Interfaces Bi-directional RS232 serial. For connection to a PC and transfer data.Parallel Contronics printer. Update Via the internet and PC Power Rechargeable batteries included, 6V 3.2 Ah or via adapter to mains power supply 100-240V / 9V Dimensions 227x282x105mm Weight 2.4 Kg