... 5%T/5minSELON SE-722 VISIBLE SPECTROPHOTOMETER, Wavelength setting, multi-point curve calibration Visible Spectrophotometer, portable spectrophotometer, spectrophotometerFEATURES: ... by keyboard-input.2,Single-point curve calibration and multi-point curve calibration ( Up to 12 points).3 ... readout directly with up to 50 sets of curve parameter and testing data stored4,System clock management, dark ...