PerkinElmer Instruments offers the Lambda series of UV/VIS spectrometers, double-beam instruments that are controlled with UV WinLab software, which is included with the instruments. Also included are modules for kinetics and biochemical analysis. The series comprises three models, the Lambda 25, 35 and 45, which differ in optical resolution and stray light performance. Absorbance measurements as high as 3 A and as low as 0.003 A make them suitable for studying samples available only in small quantities, such as DNA. A wide range of accessories are available to customize and automate sample handling.