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Thermoworks Thermapen ONE is the newest addition to an excellent line-up of their instant-read thermometers. Its unmatched speed, accuracy, and feature set have raised the bar for cooking accessories.

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Recently, a tile mosaic panel was added to the thermometer exhibit. This artistic representation of key sites at the park provides information about how temperatures vary with elevation. Mojave area artist Rebecca Lowry of JT Lab designed and completed much of the work.

Tip: Thermometers with a red line instead of silver are not mercury and not restricted. Digital thermometers are also not restricted, unless powered by lithium batteries. See FAA regulations for more information on quantity limits.

Fahrenheit

Daniel Gabriel Fahrenheit was a Polish physicist who invented one of the most familiar types of thermometers, which uses mercury in glass. Fahrenheit also had a temperature scale named after him.

For many people, the words "thermometer" and "mercury" are practically synonymous. That association is unfortunate: Mercury is a potent neurotoxin, and every thermometer that contains it is a potential environmental threat. In the 21st century, however, that is a risk that no one needs to take, and a worldwide effort is underway to deploy substitute devices in consumer, professional, and industrial applications.

NIST began an active mercury-reduction campaign in 2007, and stopped calibrating Hg thermometers entirely on March 1, 2011. A full range of thermometric calibration services continues for non-mercury devices.

Today, there is no scientific or metrological reason to employ mercury thermometers for any application. That may come as a surprise. Fahrenheit chose mercury because it gave more precise readings over a wider range than the alcohol mix he used in his first thermometer. And now, three centuries later, many people assume that Hg thermometers must be the ultimate benchmark for temperature because the specifications for some procedures and processes in commerce and industry still refer to mercury analog instruments. Professional groups and standards organizations, however, are rewriting their specs to reflect the global phase-out of Hg thermometers.

In fact, the only defining instrument specified in ITS-90 for the range of temperatures from -259.35 oC to 961.78 oC is the platinum resistance thermometer, a solid-state, digital device. (See more about ITS-90 here.)

Numerous government entities are encouraging or mandating alternatives. In early 2012, for example, the U.S. Environmental Protection Agency (EPA) promulgated a new rule providing flexibility in replacing mercury-containing industrial thermometers while remaining in full compliance with EPA regulations.

There are also practical reasons to avoid mercury thermometers, including the considerable financial and administrative burdens they can impose in the case of a spill or other accident. Laws and regulations regarding mercury disposal and remediation vary from place to place (for a representative list, visit the EPA site), and most are quite exacting. Clean-up costs in the thousands -- or even tens of thousands -- of dollars are not uncommon.

The resources featured on this and connected pages can help users make intelligent and informed decisions about replacing Hg thermometers, acquiring the right kind of digital thermometer for a specific application, ensuring that the devices meet the latest standards, and disposing of mercury.

Background: Although core temperature can be measured invasively, there are currently no widely available, reliable, noninvasive thermometers for its measurement. We thus compared a prototype zero-heat-flux thermometer with simultaneous measurements from a pulmonary artery catheter. Specifically, we tested the hypothesis that zero-heat-flux temperatures are sufficiently accurate for routine clinical use.

Methods: Core temperature was measured from the thermistor of a standard pulmonary artery catheter and with a prototype zero-heat-flux deep-tissue thermometer in 105 patients having nonemergent cardiac surgery. Zero-heat-flux probes were positioned on the lateral forehead and lateral neck. Skin surface temperature probes were attached to the forehead just adjacent to the zero-heat-flux probe. Temperatures were recorded at 1-minute intervals, excluding the period of cardiopulmonary bypass, and for the first 4 postoperative hours. Zero-heat-flux and pulmonary artery temperatures were compared with bias analysis; differences exceeding 0.5C were considered to be potentially clinically important.

U.S. Department of Labor Occupational Safety and Health Administration inspectors determined Kessler Thermometer Corp. overexposed employees to airborne elemental mercury in August 2022 while they worked to distill and purify elemental mercury, fill thermometers, blow glass and during calibration and engraving of thermometers and hydrometers.

Place the food thermometer in the thickest part of the food. It should not touch bone, fat, or gristle. Start checking the temperature toward the end of cooking, but before you expect it to be done. Be sure to clean your food thermometer with hot soapy water before and after each use.

To see where to place a food thermometer in different cuts of meat, see Thermometer Placement and Temperatures. For more information on cooking temperatures for all types of food, see the Safe Minimum Cooking Temperatures chart.

You need to open the Natural Cycles app to sync your data from your device to your phone. Our Bluetooth thermometers saves up to ten temperatures, but we recommend you sync daily to get your latest fertility status.

The high resolution LCD full-colour digital display delivers temperature information in less than 300 milliseconds, while Temperature Scan Mode allows you to easily determine minimum, maximum, and average surface temperatures for ultimate accuracy to within 4 F. The thermometer comes calibrated specifically for the cordierite baking stones used inside Ooni ovens, but an adjustable emissivity setting lets you easily read steel and other materials and finishes.

Digital thermometers contain a button battery that contains hazardous materials and must be recycled. Remove and recycle the battery. The rest of the digital thermometer may be put in the garbage. If you cannot remove the battery, take the entire thermometer to a Hennepin County Drop-off Facility.

Alcohol thermometers do not have any hazardous materials and can be put in the garbage. Alcohol thermometers are often meant for outdoor use as the alcohol keeps the liquid from freezing. These thermometers usually have red or blue liquid inside.

Mercury thermometers: These thermometers are made of glass and have a small amount of silvery liquid. Mercury thermometers are accepted at Hennepin County Drop-off Facilities as household hazardous waste.

If you have a broken mercury thermometer, follow the instructions on the MPCA factsheet Cleaning up Spilled Mercury in the Home and bring broken item and clean up materials in a closed bag to a Hennepin County Drop-off Facility.

It depends on the type of thermometer. Digital thermometers with a metal probe work through the resistance of the metal (how hard it is for electricity to flow through it) as the temperature changes, such as when it is inserted under the tongue. The thermometer has a microchip that measures how much resistance there is and then translates that into temperature. Dr. Katz explains that other thermometers use heat and infrared sensors to obtain temperature readings.

A thermometer should be cleaned after each use. Dr. Katz recommends washing the tip of the thermometer with cold water and antibacterial liquid soap, which should not come into contact with the screen. You can also wipe down the tip with alcohol-based wipes of at least 70% alcohol to disinfect or sanitize the tip, he adds. Make sure to wipe the thermometer dry with a soft cloth after each clean.

In spite of the considerable demand and expectation in various fields of life science, intracellular temperature distributions within living cells have not yet been observed, because no thermometry was capable of intracellular temperature mapping. First of all, conventional thermometers (that is, thermography and thermocouples) have low spatial resolution (up to 10 m) and are unable to function within cells. In contrast to conventional thermometers, fluorescent molecular thermometers8,9,10,11,12 are promising tools for intracellular thermometry, as they function at the molecular level. Nevertheless, when considered as a tool to observe intracellular temperature distribution, the fluorescent molecular thermometers should simultaneously satisfy multiple requirements, that is, high temperature resolution, high spatial resolution, functional independency of environmental changes in pH and ionic strength, as well as functional independency of surrounding biomacromolecules, and concentration-independent output. The unavailability of these features has been an obstacle to intracellular temperature mapping. For example, we created a fluorescent nanogel thermometer (FNT) by combining a thermo-responsive polymer with a water-sensitive fluorophore in addition to intensive developments of the fluorescent molecular thermometer over the past few years13,14,15,16,17,18,19,20,21. As we reported in a previous paper, FNT functioned even in living cells and showed high sensitivity to changes in temperature, thus enabling intracellular thermometry with high temperature resolution (better than 0.5 C in the range between 27 and 33 C)22. However, FNT could measure only the average temperature of the whole cell. It could not reveal any intracellular temperature distribution, because the relatively large size (62 nm or more in hydrodynamic diameter) and low hydrophilicity (aggregation was induced at temperatures higher than 27 C) of FNT hindered the dispersion of this temperature probe throughout the cell. ff782bc1db