Precise Ultraviolet Measurement: The ST-510 UV Meter is specifically designed to measure ultraviolet light in the ran from 220 to 275 nanometers (), 380 to 320 nanometers (UVA), and 280 to 400 nanometers (UVAB) Convenient and User-friendly Design: Featuring a backlit LCD and a 4-digit dual , the ST-510 UV Meter ensures easy reading of measurement results even in low-light conditions Reliable Performance and Calibration: The ST-510 UV Meter provides reliable and accurate readings with an accuracy of ±4% at 23±5oC. It is calibrated at specific wavelengths such as 254 nm for , 365 nm for UVA, and 365 nm for UVAB Extensive Memory and Data Stora: With a memory capacity of 20 points and an additional slot for interval time recording, the ST-510 UV Meter enables users to record and store multiple measurement data conveniently Compact and Portable: Designed with portability in mind, the ST-510 UV Meter weighs approximately 90g and has compact dimensions of 140 x 49 x 29 cm (5.51 x 1.93 x 1.14 inch)