Portable, microprocessor controlled colorimeter with modern energy saving LED technology, battery-/rechargeable battery operation, real-time clock, built-in timer, datalogging capacity for up to 99 measurements and AutoOff function; Wavelength: 420, 520, 560, 610 nm; Cell-Compatibility: 1-inch round; 16mm COD/TNT/Unicell with adapter; 13mm with adapter; RS-232 interface with data transfer adapter; Operation mode: Preprogrammed for 90 HACH methods; Absorbance and Transmittance; Linear and non-linear calibration curves; Warranty: 2 Years, expandable to 3 and 5 Years