Glucose meter and incandescent light bulb: what they have in common

1. Step 1. Glucose meter — uses — Electrochemical reaction. An electrochemical sensor.
2. Step 2. Electrochemical reaction — is used in — Dry cell. A chemical source of current.
3. Step 3. Dry cell — is part of — Torch (flashlight). Batteries.
4. Step 4. Torch (flashlight) — has part — Incandescent light bulb. A bulb (today an LED).

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