Is the ceiling height the same across the room?

Ceilings
Layout
Accuracy

A ceiling is assumed flat until something long has to fit under it, and by then the deflection is somebody's problem. Checking it means a reading at several points, which with a tape is a ladder move each time. The T1R Range shoots each point from the floor in seconds, so a room gets four or five readings instead of one, and the variation between them is the answer rather than a single number that hides it.

Why one reading is not enough

A ceiling is assumed flat until it is not
219, 216, 215 across the same room
Each point shot from the floor with the T1R
No ladder move between readings
The T1R Range makes the spread the answer

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A commercial space is measured with insulated mains and black conduit racked above a partly installed ceiling grid. The tool is aimed up from floor level at several points in turn and the display returns two hundred and nineteen, then two hundred and sixteen, then two hundred and fifteen. No ladder is set for any of them.