measure body temperature over a small temperature range centered around 37°C. Digital thermometers provide faster, more convenient measurements and also eliminate the environmental hazard of mercury in legacy thermometers. Probe and ear digital thermometers are the two most common types. Temple and forehead types are also available. The probe type is used in the same way as a traditional mercury stick thermometer and measures oral, rectal, or armpit temperatures. The ear type is a non-contact thermometer that measures the infrared energy radiated from the ear canal.

HEARING AID

Hearing Aids are electroacoustic devices typically worn in or behind the ear and are designed to amplify and modulate sound for the hearing impaired. The microphone converts sound into an electrical signal, the signal conditioning process amplifies and/or edits the signal, and the receiver (speaker) converts the signal back to sound. The battery powers the whole process.

INFUSION PUMP

An infusion pump delivers fluids, medication, or nutrients to a patient via the circulatory system, subcutaneously, or epidurally, via controlled pressure injecting. An infusion pump is used when it is otherwise impossible to treat a patient at the prescribed times and quantities, such as in minute quantities smaller than what a drip system can deliver.

PULSE OXIMETER

Pulse Oximeters measure oxygenation levels in patients by noninvasively or continuously monitoring oxygen saturation in arterial blood. Most Pulse oximetry systems use a transmissive optical technique, featuring a clip with optical electronics attached to a finger, toe, or ear. Light is transmitted through the skin on one side of the clip and received on the other, using LED's and a photodiode.