Instant, one second reading (takes 250 scans per second). Convenient storage case keeps thermometer and lens covers together. Engineered button placement ensures, safe comfortable use. Sleek design fits comfortably in the ear and in the palm of any size hand. Meets accuracy standards of ASTM (E 1965-98). Memory feature recalls last temperature reading. Measuring mode reads in Fahrenheit and Celsius. Lens cover detection for hygienic use. Five-year warranty.