Find the thickest edible section
The sensing area must reach the part likely to heat most slowly. On chicken pieces, that is usually the center of the thickest flesh; approach from the side when the piece is too thin for a top-down insertion.
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Guide
For a whole chicken, check the innermost thigh and wing plus the thickest breast. For pieces, place the sensor in the thickest center without touching bone.

The sensing area must reach the part likely to heat most slowly. On chicken pieces, that is usually the center of the thickest flesh; approach from the side when the piece is too thin for a top-down insertion.
USDA guidance calls for checking the innermost thigh and wing area and the thickest part of the breast. A single breast reading does not represent the entire bird.
Aim for meat, not bone or open space. If the tip touches bone or passes into the cavity, pull it back and reposition so the sensing zone is surrounded by flesh.
For a breast, insert into the thickest center, often from the side. For a thigh, place the tip in the thickest meat while staying clear of the joint and bone.
USDA lists 165°F as the safe minimum internal temperature for all poultry. Let the reading stabilize as directed by the thermometer maker and recheck any cooler spot.
A probe that touched undercooked chicken can transfer contamination. Clean and sanitize it according to its instructions before the next check or before it contacts ready-to-eat food.
Common questions
Place the sensing area in the thickest center of the breast. For a thin breast, inserting from the side makes it easier to keep the probe surrounded by meat.
Check the innermost thigh and wing and the thickest breast, avoiding bone. Each location should meet the safe endpoint.
It should not. Bone can make the reading unrepresentative, so reposition the probe into the surrounding flesh.
Color and juices are not reliable substitutes for temperature. USDA recommends confirming 165°F with a food thermometer.