These thermometers can be used on the forehead, mouth, armpit or rectum.a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. with changes in temperature, the mercury expands and contracts and the temperature can be read from the scale. mercury thermometers can be used to determine body, liquid, and vapor temperature. new mercury thermometer temperature range: 35o celsius (94afahrenheit) - 42o celsius (108o fahrenheit), precision of 0.1 on the celsius scale and 0.2 on the fahrenheit scale. applicable in buccal, axillary and rectal positions. Glass Scale:oC or oF, oC &oF Accuracy: ±0.1oC(±0.2oF) measuring range:35-42°C,min interval is:0.10°C