Paper, wireless or tap: choosing fridge temperature monitoring for a commercial kitchen

Every commercial kitchen records fridge temperatures. How you record them is crucial, because it affects how much you can rely on those numbers when an environmental health officer asks to see them, or when a fridge quietly packs in overnight.

There are four main ways kitchens do it, here's how they compare.

What UK food law asks for

In England, Wales and Northern Ireland, chilled food must be kept at 8°C or below. The Food Standards Agency recommends setting fridges to 5°C or below, which gives you a margin for door openings and deliveries. It recommends checking fridges and freezers at least once a day, but most kitchens check twice, usually in opening and closing checks.

The law doesn't specify a method. You just need food safety procedures based on HACCP principles and records that show those procedures are working. (GOV.UK: chilling and freezing)

1. Handwritten record sheets

A sheet on the fridge door, a pen on a string, two readings a day. This is still how most kitchens start out, and it costs almost nothing.

Paper falls down in predictable ways. Checks get missed during a rush and filled in later from memory, readings start to look suspiciously similar, sheets get splashed, lost or accidentally binned with the prep list. Even when done properly, a sheet only ever records what the thermometer showed, which tends to be the ambient air near the door, not the actual high-risk food.

We'd always point kitchens towards something digital, it’s reliable and usually much quicker too. That said, if paper is what you're using for now, use a sheet built for the job. We recommend the free fridge temperature record sheet, which has opening and closing checks for every day of the month, initials for each reading, a column for corrective action and a manager sign-off. The target and legal maximum are printed at the top, so nobody has to guess what a good reading looks like. And best of all: It's free, with no sign-up required.

Best for: very small operations, or as a stopgap while you sort something better.

2. Digital thermometers and standalone data loggers

A step up from paper. Digital thermometers give a more precise reading. Standalone data loggers sit in the fridge and record continuously, and you download the history to a computer or app.

Loggers solve the gaps problem because they record whether anyone is watching or not. The catch is that someone has to remember to download the data and actually look at it. A logger can record a failing fridge for a week without anyone knowing. They also measure air temperature, which swings every time the door opens, so a busy service can produce alarming numbers even when the food is fine. 

There’s a quieter knock-on too. Once the logger is doing the recording, the daily trip to the fridge stops being part of anyone’s routine. Visual checks on door seals, storage order and labelling can slip and nothing in the record will show it. 

Best for: kitchens that want a continuous record and have someone who will review it regularly.

3. Wireless monitoring systems (LoRa and similar)

Wireless systems put a sensor in each fridge and send readings over a network, often LoRaWAN, to a gateway and then to an online dashboard. They're sold on live alerts and never having to check a fridge again. In a working kitchen, both of those promises create real problems.

Start with installation: you need a gateway, plus a signal that reaches every fridge, freezer and cold room. Walk-ins are essentially insulated metal boxes, and basements and back corridors are rarely kind to wireless signals, so coverage alone can turn into a project of its own..

Then there are the alerts… most sensors read air temperature, and air spikes every time the door is propped open for a delivery or hammered during service. Too many false alarms and the team stops reacting to them, which means that when a real problem happens, the alert might get ignored anyway.

The bigger issue is what disappears completely. If readings arrive by themselves, nobody needs to go to the fridge. That means nobody notices the split door seal, the raw chicken above the salad or the unlabelled tub tucked away at the back. A daily temperature check was always partly an excuse to look inside the fridges and freezers, and a dashboard takes that away.

Best for: sites willing to invest in the infrastructure and with someone dedicated to managing it.

4. TempLog® : tap-to-log sensors

TempLog® is our answer to the above problems, launching in early 2027. A TempLog® Sensor sits in the fridge or freezer and is built to mimic high-risk food, so it reflects the temperature of what's on the shelves rather than the air rushing in when the door opens. To log a reading, staff simply tap the sensor with their Labl.it handheld device, and the record lands on the same platform as your labels. No handwriting, no retyping, no gateway.

It works without a battery, logging a reading each time it's tapped. Add a battery and it logs continuously between taps, so a single tap can collect the full history.

The tap is the core of the benefit. It’s quicker and easier than handwriting, but it also means someone has to stand at the fridge, so a quick visual check is guaranteed. And because the reading comes straight from the sensor, it’s accurate and doesn’t have to be filled in from memory at the end of a shift.

TempLog® Sensors won't text you at 3am. Readings reach your records when someone taps. What you get instead is a daily check your team can't skip or fake, with food-temperature readings an EHO can trust. TempLog® Sensors are an add-on to a Labl.it subscription and work with the Labl.it device.

Best for: kitchens that want trustworthy, food-temperature records without a wireless install, especially those already using Labl.it for labelling.

See how TempLog® Sensors work

Side-by-side comparison

Which option best suits your kitchen?

Start with the question an EHO will ask: can you show the fridge has been maintained at the right temperature, and that someone acted when it wasn't?

• If you're small and on paper, use a proper record sheet like this one and get a manager to sign it off every month. For the long term, plan your move to something digital.

• If you're weighing up a wireless system, factor in the install and initial setup cost, the subscription and who will manage the alerts, and think about what happens to your daily checks once nobody needs to open the fridge.

• If your problem is records you don't quite trust, with gaps, guesses and the same reading three days running, TempLog® keeps the daily check in the routine and takes the pen out of it.

  
  

Frequently asked questions

Is a handwritten fridge temperature log acceptable to an EHO?

Yes, provided it's complete, accurate and shows what you did when a reading was out of range. For a free template, click here. Problems arise when entries are missing, illegible or clearly filled in after the event, or when an incompliant temperature was recorded and no action was visibly taken.

Should I measure air or food temperature?

Air temperature reacts to every door opening, so it often looks worse than it is during service. Food temperature, or a sensor that mimics food, gives a truer picture of whether your stock is safe.

How often should fridge temperatures be checked?

The FSA recommends at least once a day, starting at opening.

TempLog® launches in early 2027, and you can register interest now for first access. In the meantime, see what Labl.it does for your prep and allergen labelling with a free 14-day trial: no long-term contract, and 95% of kitchens that try it keep it.