Khris Contemprato, an operator of Dexcom’s transmitter manufacturing line in San Diego, presses the start cycle on the computer numerical control mill to give the transmitter its final shape. Dexcom’s technology includes a sensor — typically on a patient’s abdomen — that measures just below the skin, and a transmitter relays glucose level data every five minutes to a smart device.

Khris Contemprato, an operator of Dexcom’s transmitter manufacturing line in San Diego, presses the start cycle on the computer numerical control mill to give the transmitter its final shape. Dexcom’s technology includes a sensor — typically on a patient’s abdomen — that measures just below the skin, and a transmitter relays glucose level data every five minutes to a smart device. Photo by Melissa Jacobs.

— Seated beside an oval table in his office, Kevin Sayer squints to read a text on his phone...

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