Temperature control
Presets, adjustable settings and live temperature
Temperature features answer different questions: what can you select, what does the screen show, and how does the kettle hold the water afterward?
A preset is a particular offered choice
A button labeled for green tea, coffee or boiling usually refers to a documented heating setting. Read the exact value and the applicable edition rather than assume every brand uses the same number for the same drink name.
Presets can be convenient when they match the choices you repeat. Their usefulness does not depend on having the largest count. Several clear settings may be enough, while one missing setting can matter if your routine specifically needs it.
An adjustable range still has a control increment
A kettle may let you move through temperature settings within a range. Check the actual steps in the active unit. A Fahrenheit control with a particular increment is not automatically equivalent to selecting every whole degree Celsius.
For an exact requirement, convert the desired value to the kettle's native control unit and check the offered setting. Do not round a nearby preset into a match. The finder uses the documented settings; a range with an unknown increment cannot prove every intermediate target exists.
A live reading is different from a target label
A screen can show the selected target, the current reading, or both at different stages. A lit temperature button is not necessarily a live readout. If you want to follow the heating progress numerically, choose a documented live-display feature.
Read the units too. A Celsius-only display may be perfectly suitable for one person and awkward for another. Selecting a Fahrenheit requirement should refer to an actual offered display, not a number we convert for a review table.
Setting precision is not measured accuracy
The control's smallest step, display resolution and actual water-temperature accuracy are different properties. A setting available every degree does not itself prove that the water always remains within one degree of that target.
Documentation-led assessments can explain the controls and any scoped manufacturer accuracy statement. They should not present those statements as a laboratory measurement. Water amount, location and the precise measuring arrangement would matter to a real performance test.
Combine the target with the holding routine
A kettle can offer selectable heating but hold water at only a separate fixed temperature. Another can hold its selected target. If both functions matter to you, check them in the same supported arrangement.
Use the ordinary selectable-temperature choice first. Add one exact target only when you need it, then require holding if it is part of the routine. Treat a recipe's temperature as a brewing choice; the kettle setting is not medical advice, proof of sterilization or a universal drinking-temperature recommendation.