1. With backlit LCD display, the reading is clear and clear 2. The advanced holographic blazed grating C-T monochromator has the advantages of high wavelength accuracy, good monochromaticity and low stray light 3 note：This product does not support 110V voltage. Please do not place an order if the voltage is not compatible, otherwise you will need to provide your own transformer. 4. The measurement reading has high accuracy, good repeatability and stability 5. Maximum allowable wavelength error: ± 2 nm