The kettle setting is not the leaf temperature
The number on a kettle describes water in the kettle. The pot, pouring distance and waiting time all influence what reaches the leaves.
Follow the water out of the kettle
A kettle set to a chosen temperature does not create a temperature-controlled teapot. The water passes through the spout, travels through the air and meets a vessel that may be much cooler. The leaves and infuser are also part of that encounter. This does not make the kettle setting useless. It means the setting is one point in a sequence rather than a guarantee about every moment of the infusion.
The size of the brew matters too. A small amount of hot water poured into a heavy, cold pot can lose a larger share of its heat than a generous amount in a prewarmed vessel. You do not need to calculate that exchange to make good tea. Keeping the same pot, fill level and preparation routine is often enough to improve consistency from one cup to the next.
Measure only if the answer will help
A suitable food thermometer can show what happens in your vessel. Use it according to its instructions, keeping the sensing area in the water and away from the hot base or wall. Do a separate water-only trial first so that you are not juggling a probe, loose lid and kettle while trying to time a real infusion. Avoid immersing an electronic handle that is not designed to get wet.
Notice the reading soon after pouring and again after a short interval. Treat those numbers as observations about this setup, not universal deductions about all teapots. A different volume or a warmer room can produce another result. The practical question is whether an unexpected temperature drop explains a weak or inconsistent brew, not whether your kitchen can reproduce a laboratory graph.
Adjust the routine with the tea in mind
For a tea that benefits from a reliably hot infusion, prewarming suitable teaware may be helpful. For a delicate tea with a lower recommended starting temperature, simply increasing the kettle setting may overshoot the result you want. Follow the packet's method first and change one part of the routine at a time. Ordinary herbal and fruit infusions still require the stated boiling-water preparation; a low reading after careless handling is a reason to improve the process, not to redefine the instruction.
