FermenteaWhere food goes to change
Equipment · Instruments
A thermometer gives a reading at its sensor; a temperature logger records readings over time. Sensor placement and context determine what that record can tell you.
A food thermometer reports temperature at its sensing point. A data logger takes readings at intervals and stores them with time information, creating a trace of conditions during storage, transport, heating or cooling. Some devices combine a display, probe and recorder; others log ambient temperature or require later download. The name alone does not tell you what the sensor measures or how often it records.
This page focuses on the logger’s time series. A separate [food thermometer and refrigerator thermometer page](/equipment/food-thermometer-refrigerator-thermometer) explains spot readings in food and appliance air. A logger supplements such checks when a process requires a record over time; it does not automatically replace a probe thermometer used to check the centre of a particular food.
A record is meaningful only if the sensor represents the condition being evaluated. Air in a refrigerator or cooler can change faster than the temperature inside a food, and the centre of a thick product may heat or cool at a different rate from its surface. A logger placed on a shelf records conditions at that point; a probe placed in a product records the probe’s local temperature. The monitoring plan should specify the location, product or surrogate, interval and response when readings fall outside the established limits.
FDA’s seafood-processing guidance describes thermometers and continuous temperature recorders, including data loggers, as possible ways to monitor a cooling process. It presents these as options within a processor’s established hazard-control plan, not as a universal recipe. Its example limits and schedules apply to their stated context and should not be copied to unrelated foods or home preservation.
Before relying on a device, establish that its range and probe suit the intended conditions, and check its accuracy using the manufacturer’s instructions and a suitable reference. FDA guidance calls for checking temperature-indicating and recording devices before service and describes calibration against a known accurate reference; the exact procedure and frequency depend on the device and its use. A logger’s timestamp, interval, memory, battery, alarms and download method also affect whether the record is complete and interpretable.
A trace can reveal excursions that a single reading misses, but it cannot show an unmeasured product’s exact core temperature unless the sensing arrangement supports that inference. It does not prove a product is safe, establish pH or water activity, or validate a preservation process by itself. NIST’s cited logger study concerns vaccine monitoring, not food; it is useful here only as a reminder that instrument calibration stability is a measured, application-specific question.
Current government food-safety guidance documents thermometers and continuous temperature-recording devices. These sources establish present use, not an invention date or single design.
Country-level association reflects federal FDA guidance describing continuous time-temperature data loggers in specified food-process monitoring examples; it does not claim invention or exclusive use.
A food probe measures the temperature inside food at the probe tip; a refrigerator thermometer measures the cold storage environment. They answer different questions and cannot establish acidity or validate a preservation process.
A microcontroller is a programmable chip. A development board adds connections and supporting parts; with a suitable sensor and software, it can record readings without validating their meaning.
A shallow rack base and tall vented cover process jars in atmospheric steam. NCHFP limits the method to tested high-acid or acidified recipes requiring no more than 45 minutes, including altitude adjustment; this is not pressure canning.
A covered iron vessel used in Maine bean-hole cooking, set into a preheated stone-lined pit and buried for a slow cook.
A deep, lidded pot with a removable rack processes jars beneath boiling water. It is intended for foods with tested boiling-water processes; low-acid foods require pressure canning.
A contemporary household enclosure for preparing mā, fermented breadfruit, documented in Hawai‘i using food-safe buckets, coolers or large sealable bags in place of a pit.
Containers for salt-curing fish and meat range from broad-mouthed stoneware crocks to tubs, cut-down barrels and chests. Their material, depth, cover and ability to retain or drain liquid shape how the food sits in salt or brine.
A bulk brining vat holds cucumbers and other vegetables under cover brine for fermentation and storage. North Carolina sources document a mid-century wooden tank yard and later outdoor fiberglass systems.
Threaded, heat-processing jars hold food and a fitted lid during a tested canning process; jar size and process belong to the specific recipe.
A chocolate refiner or melanger uses powered rotation and stone rollers to refine cocoa mass. Some models also process nut and seed pastes; design, material and operating limits vary.
Soft, spreadable Calabrian pork sausage made with a great deal of red chilli and fatty pork, stuffed into natural casings, sometimes smoked and matured while staying soft.
A way to add independent temperature logging to an existing food dehydrator without changing its built-in controls or protections. It is a monitoring method, not a rewiring plan.
Pleurotus cystidiosus is the abalone mushroom, a cultivated oyster-type fungus with dark brown caps that grows more slowly and is more demanding than other Pleurotus species.
A dark, balanced vinegar from Emilia-Romagna made by combining cooked or concentrated grape must with wine vinegar, then acetifying and refining it in wood under a protected specification.
A living dairy inoculum that starts controlled cream fermentation, developing acidity and aroma before sour cream or cultured butter is finished.
A small electric incubator holds jars at a selected temperature for yogurt and other documented warm food preparations. Controls, capacity and vessel arrangement vary by model.
Adygean salt is a seasoned table salt associated with Adygea and the wider North Caucasian culinary tradition. Salt is blended with garlic and a variable selection of herbs and spices; the exact mix depends on the named style and maker.
The African Caesar-group mushroom, Amanita masasiensis, is a wild ectomycorrhizal species of central and southern African woodlands, eaten locally. The genus contains deadly poisonous species, so identification needs care.
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U.S. Food and Drug AdministrationFood process monitoring · Time temperature recording
Fish and Fishery Products Hazards and Controls Guidance, Chapter 12: Pathogenic Bacteria Growth and Toxin FormationFDA guidance describes a continuous temperature-recording device, including a time-and-temperature data logger, as one monitoring option for a cooling process.
It describes checking device accuracy before use and calibration against a known accurate reference device; instructions are tied to the specific monitoring plan and device.
Cited in: A reading and a record answer different questions; Where the sensor sits matters; Accuracy, records and limits
National Institute of Standards and TechnologyMeasurement limitations · Logger calibration
Calibration Stability of Data Loggers Used for Vaccine Temperature MonitoringNIST studied calibration stability in digital data loggers used in vaccine storage, a different application from food.
The report supports treating calibration and verification as instrument-specific matters; its vaccine findings are not food-process validation.
Cited in: Accuracy, records and limits
USDA Food Safety and Inspection ServiceProbe placement · Spot temperature
How to use a food thermometer?FSIS advises placing a food thermometer in the thickest part away from bone, fat or gristle, where applicable.
Cited in: A reading and a record answer different questions
USDA Food Safety and Inspection ServiceThermometer distinctions
What is a thermocouple thermometer?FSIS says some thermocouple designs measure at the tip and are intended for quick checks near the end of cooking rather than remaining in the food.