4 ways to automate food probe accuracy tests

#1 - Simple log

Who it's for: Single-site kitchens where the chef tests the probe themselves. No second checker, just a need to prove the probe reads true.

What it is: A food probe accuracy test is a record of a probe's reading in iced water and in boiling water. This version keeps it to the two readings that belong to one test: the reading in iced water and the reading in boiling water, in one box so each probe's test reads as one check. A probe should read 0°C in iced water and 100°C in boiling water, give or take a degree. Every cooked, chilled, and delivery temperature you record depends on the probe being right, so this is the check underneath all the others.

Available on: Basic.

In practice: A single-site kitchen tests its probe each week. The chef fills a cup with iced water, reads 0°C, then boiling water, reads 99°C. Both within tolerance, logged in one box. If a probe reads 3°C in iced water, the log is what flags it before a week of cooked-food checks are taken with a faulty probe.

Why it works: Both readings live in one box, tied to a probe, so a test can never be logged half-done. The record proves the probe was sound on a given date, which is what backs up every other temperature record you keep.

Steps included:

• 1 grouped check (one box per probe) holding: reading in iced water (number), reading in boiling water (number)
• Duplicate the box for each probe

When to upgrade:

1. Rota staff run the test and don't all know the tolerance
2. Your EHO wants proof, not just typed numbers
3. You run more than one site and want a named sign-off

#2 - With guidance

Who it's for: Kitchens with new starters or rota staff who don't all know the expected readings and tolerance.

What it is: The simple test with a guidance note added to the box. The note explains that the probe should read 0°C in iced water and 100°C in boiling water within about a degree, and that a probe outside that should be recalibrated or taken out of use because it can no longer be trusted.

Available on: Standard.

In practice: A high-turnover kitchen runs this. A new chef de partie reads 0°C and 102°C, sees the note saying that is outside tolerance, and takes the probe for recalibration instead of carrying on with it. The faulty probe never gets used for a real cooked-food check.

What it adds to the previous template:

1. The expected readings and tolerance are on screen at the moment of the test
2. New staff know what counts as a fail without asking
3. The "recalibrate or remove from use" action is in front of them

Why it works: The guidance sits in the same box as the readings, so staff see it as they test. It turns the standard into a prompt that is always on screen.

Steps included:

• 1 grouped check (one box per probe): reading in iced water (number), reading in boiling water (number)
• 1 guidance note in the box (expected readings and tolerance)

When to upgrade: When typed numbers are no longer enough and you want photo proof of the readings (Probe #3), or a named sign-off for an audit trail (Probe #4).

#3 - With photo evidence

Who it's for: Kitchens under EHO scrutiny that want to show their probes are calibrated, not just claim it.

What it is: The guided test plus a photo of the readings. A photo of the probe at 0°C in the iced water, and again at 100°C in the boiling water, is proof the test was run and passed, which underpins every other temperature record you show an inspector.

Available on: Standard.

In practice: A care-home kitchen photographs its weekly probe test. When an inspector questioned whether the cooked-food temperatures could be trusted, the calibration photos showed the probe behind them was reading true.

What it adds to the previous template:

1. A photo of the readings, captured at the time
2. Proof the probe was calibrated, which underpins every other check
3. A visual record that ties the test to a real probe

Why it works: Evidence taken in the moment is far stronger than numbers recalled later. The photo ties the calibration to the actual probe and time, so the temperature records that depend on it hold up too.

Steps included:

• 1 grouped check (one box per probe): reading in iced water (number), reading in boiling water (number)
• 1 guidance note in the box (expected readings and tolerance)
• 1 photo in the box (the readings)

When to upgrade: When the test needs a named, dated sign-off so an audit can see who confirmed it (Probe #4).

#4 - With photo and signature

Who it's for: Multi-site groups where someone signs off the probe tests and the records have to stand up across sites.

What it is: The photo test plus a signature. The person running the test signs to confirm the probe reads within tolerance. For a group, that signature makes each site accountable for the calibration that all its other temperature records rest on.

Available on: Standard.

In practice: A 25-site restaurant group runs a weekly probe test with photos at every site, signed off by the duty manager. The food safety lead can confirm, across the estate, that every probe behind every cooked-food record was calibrated, all timestamped.

What it adds to the previous template:

1. A signature confirming the probe reads within tolerance
2. Named accountability for each site's calibration
3. A complete record (readings, photo, signature) an auditor treats as best practice

Why it works: A signature turns a set of readings into a record someone has put their name to. With the photo and the readings, it is the full evidence an EHO or a group auditor wants, and it backs up every temperature check the probe is used for.

Steps included:

• 1 grouped check (one box per probe): reading in iced water (number), reading in boiling water (number)
• 1 guidance note in the box (expected readings and tolerance)
• 1 photo in the box (the readings)
• 1 signature in the box (sign-off)

When to upgrade: When you want Poppi to flag a failed probe test to the manager on its own, or pull every site's calibration records into one report. Those versions are coming in the next post update.

How to pick the right version

You don't need to know our product to choose. Just answer three questions about how your kitchen runs.

Is it just you testing the probe, or do other people do it too?

If you test it yourself and know the tolerance, a plain log is enough. The moment rota staff do it, the tolerance needs to be on the screen. If only you test, #1 is fine. If anyone else does, start at #2.

Do you need proof, or is a record enough?

A record tells you numbers were logged. Proof is something you can put in front of an inspector. Because every other temperature record rests on this one, proof carries weight here. If numbers are enough, stop at #1 or #2. If you are under scrutiny, #3 adds a photo of the readings.

Does someone need to sign off the test?

In one kitchen, the record speaks for itself. Across sites, an auditor wants to know who confirmed each probe. If no sign-off is needed, #3 is enough. If you run more than one site, #4 adds a signature.

Related reading

• Cooked food temperature check - the check this calibration underpins
• Fridge temperature check - another reading only as good as the probe behind it
• Food cooling temperature check - where a true-reading probe proves food cooled in time

Frequently asked questions

How do I test a food probe's accuracy?

Use the two-point method. Put the probe in a cup of iced water and check it reads 0°C, then in boiling water and check it reads 100°C, each within about a degree. The two points bracket the range you use in a kitchen, so a probe that passes both can be trusted for chilled and cooked readings alike.

What tolerance is acceptable?

Within about 1°C of 0°C in iced water and 100°C in boiling water. A probe reading 0.5°C or 99.5°C is fine. A probe more than a degree out should be recalibrated if it allows it, or taken out of use. Remember that boiling water is 100°C at sea level and a little lower at altitude, which rarely matters in practice but explains small variation.

How often should I test a probe?

Weekly is a common standard, and after any drop or knock that could have damaged it. A probe is a piece of equipment that drifts with use, so a regular logged test catches a fault before it has quietly invalidated a week of temperature records.

What if a probe fails the test?

Take it out of use for real checks straight away and recalibrate it if the model allows, or replace it. Record the failed readings and the action. Because every cooked, chilled, and delivery temperature depends on the probe, a faulty one found early saves you having to question all the records taken with it.

Where to go next

Every temperature you record is only as trustworthy as the probe that took it. A logged accuracy test is what lets you stand behind all the others. The versions above move from a simple log to a signed photo record, so the proof is there when an inspector asks.

Five more versions are coming in the next refresh that bring AI into the check. Poppi can flag a failed probe test to the manager, and pull every site's calibration records into one report. Those need more review time and will land separately.

→ Build your own food probe accuracy test on Pilla. The Basic plan unlocks the simple log today.