A needless glucometer measures blood-glucose levels continuously by means of a small sensor inserted beneath the skin, states Everyday Health. The meter measures glucose levels in the fluid under the skin, which closely correspond to glucose levels in the blood. This eliminates the need for finger sticks.
The sensor connects to a transmitter that sends blood-glucose levels to a monitor that emits an alarm when the person's blood sugar is too high or too low, states Everyday Health. Both the sensor and the transmitter are water-resistant, so the wearer can shower or bathe. The sensor functions for about five to seven days before it needs to be replaced.
Needleless glucometer technology, also known as continuous glucose monitoring, is approved by the U.S. Food and Drug Administration as of 2015, Everyday Health reports. However, the devices are not yet available for widespread use.