The TenderTYKES Instant Ear thermometer is clinically accurate. It does not require probe covers. Thermometer comes ready to use with one long-lasting CR2032 battery. Included is a canvas, zippered storage case. Probe tip fits comfortably into even the smallest ears. Nite-GLO® backlit digital displace glows soft green, making night time and low light measurements hassle-free. Easy to use even while a child is sleeping.