Suresign Digital Thermometer Suresign Digital Thermometer offers professional accuracy & gives results in just 30 seconds! It has a flexible tip, is waterproof & gives a fast read time, making it easy to use. Suitable for oral, underarm or rectal use. It comes in a clear carry case. Suresign Digital Thermometer measures body temperature in Oral, Underarm or Rectal use. It is easy to use & has an easy to read large display.