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: 520, 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 50 HACH methods; Absorbance and Transmittance; Linear and non-linear calibration curves; Warranty: 2 Years, expandable to 3 and 5 Years