Mercury free. A safe alternative to glass thermometers. Safe and accurate. Clinically accurate. Memory recalls last reading. Waterproof. Oral or rectal. Fast and accurate, a reading within +/- 0.2 degrees F in 60 seconds. Memory recalls and displays last temperature taken. Automatic shut-off for longer battery life. Waterproof, for easy, more thorough cleaning. No glass to break, no fear of mercury poisoning. Made in China.