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AirfryerHQ

Thermometers and probes

Leave-in cooking probe

Excellent when the appliance was built for one and awkward when it was not, because the drawer has to close.

AirfryerHQ’s verdict

Useful for a specific job

Right for one particular job. If you do not do that job, it will sit in a drawer.

If your appliance has a probe socket, use it — it is better than an instant-read for a long cook because it removes the guessing about when to check. If it does not, retro-fitting one is awkward: a cabled probe needs the drawer to close on a cable, and that is not something to improvise on an appliance whose seal and airflow are part of how it works.

Where to put a probe thermometerThree cross-sections of food with a probe thermometer. On the left, a chicken breast with the probe pushed into the thickest part, horizontally, with the tip in the centre of the meat; this is correct. In the middle, a bone-in thigh where the probe has been pushed until it touches the bone; bone reads hot and reads high, so this gives a falsely safe number. On the right, a thin fillet where the probe has gone all the way through and out the other side into the hot basket, which reads the air rather than the food. The correct placement is the thickest part, away from bone, with the tip stopping in the centre.Thickest partCorrecttip in the centreTouching boneReads too highbone reads hotStraight throughReads the airtip left the foodThe temperature is the test, not the timer.
The thickest part, away from any bone, with the tip stopping in the middle. Bone reads hot and a probe that has gone through into the basket reads the air — both of them tell you the food is done when it is not.

What it actually does

Reports the internal temperature continuously rather than at the moment you open the drawer, and on an appliance built around one will stop or alert at a target you set.

A probe that stays in the food while it cooks and reports continuously, either through a cable into a socket in the appliance or wirelessly. Some air fryers and multi-function grills ship with one and run cooking programmes from it; most basket machines cannot accept one at all, because the drawer has to shut.

When it helps and when it does not

When it helps

  • Long cooks on thick pieces — a whole chicken, a joint, a thick pork chop — where opening the drawer repeatedly costs heat and time
  • Appliances with an integrated probe, where the machine will hold to a target rather than a timer
  • Learning what your own machine does, because a continuous reading shows the shape of the curve rather than one point on it

When it gets in the way

  • Basket machines with no probe socket, where a cable stops the drawer closing properly
  • Small or thin foods, which are done before a continuous reading tells you anything an instant-read would not
  • Batch cooking, because the probe reads one piece and the batch finishes together

What to use instead

An instant-read thermometer, which costs a fraction as much and answers the same question at the only moment that matters. Buy the leave-in probe only if your appliance came with a socket for one.

Using it safely

  • Only use a probe the appliance manufacturer supplies or specifies for that appliance. A cable trapped in a drawer is a cable being crushed against a hot seal.
  • Where a manufacturer states its probe presets are set below normal recommendations to allow for carry-over, treat the authority's core-temperature target as the one that governs and check the food yourself.

What specific manufacturers say

Statements read from a named model’s own documentation. AirfryerHQ does not infer that an accessory fits a machine from its advertised capacity, and no manufacturer here publishes the dimensions that would let anybody do so.

  • Ninja Foodi MAX Health Grill & Air Fryer AG551UK

    This model has an integrated probe with presets by food type — poultry has one setting only, and the manual notes that its beef and lamb presets sit below normal recommendations because the unit carries over by 5–10°C. It also directs the reader to the UK food standards agency for safe temperatures, and states that the probe must never go in a dishwasher.

    Ninja Foodi MAX Health Grill & Air Fryer AG551UK — Instructions

Looking after it

An integrated probe is usually the one part of the set that is not dishwasher safe, and its cord and jack must not be immersed. Wipe it; do not soak it.

Evidence and confidence

Moderate confidenceWell supported, but from a narrower base of sources than we would like.
Applies to
Applies generally
Why this rating
The one model in this catalogue that documents a probe system documents it thoroughly, which is what makes it possible to say what a probe is good for without speculating. The general verdict — good if your machine has one, awkward if not — follows from the drawer having to close, which is a property of the architecture rather than an opinion.
Last reviewed
2026-08-30

What this does not cover

  • Only one model in this catalogue publishes probe documentation. Nothing here is a general claim about probe systems from other manufacturers.
  • No wireless probe has been assessed, and their behaviour inside a metal chamber is not established here.
  • AirfryerHQ has not bought, fitted or used any accessory. Every judgement here is reasoned from what the accessory does physically and from what manufacturers publish about it.
Sources (2)

  • Ninja Foodi MAX Health Grill & Air Fryer AG551UK — Instructions (PDF)

    SharkNinja Europe Limited — Manufacturer manual (United Kingdom)

    Relied on for: An integrated probe system: presets by food type, a stated carry-over allowance of 5–10°C, a pointer to the UK food standards agency, the PRBE ERR timeout state, and that the probe must never be put in a dishwasher or immersed.

    States this directly

    Passage read and verified

    Retrieved 2026-08-13 from argos-support.co.uk

    Retrieved from Argos's manual library for Argos product 735/0124. The document identifies itself as revision AG551UKSeries_IB_MP_Mv1_200630_Mv1.

  • AirfryerHQ assessment of airflow, element proximity and material behaviour

    AirfryerHQ — Calculated or inferred by AirfryerHQ (Not jurisdictional)

    Relied on for: The mechanism this is read against: forced convection, boundary-layer disruption and a small chamber.

    AirfryerHQ's interpretation of what it says

    Citation checked — the document exists and is described correctly

AirfryerHQ sells nothing and earns nothing here. There are no affiliate links, no sponsored placements and no brand recommendations anywhere in this section. The verdict above is what we think, arrived at before anybody asked whether it would sell anything.

Cooking pages this affects

Worth reading

Others in this category

  • Worth owning before anything else

    Instant-read thermometer

    The only accessory that changes what you can do rather than how comfortably you do it, and it costs less than a delivery.