Knowledge Center

Digi-Stem® Process Thermometers: Digital Temperature Measurement Built for Industry

Reliable temperature measurement is essential in industrial environments, especially when accuracy, durability, and easy readability all matter. Palmer Wahl’s Digi-Stem® Process Thermometers are designed to bring digital temperature measurement directly into demanding process applications. Available in both RTD and thermocouple models, the Digi-Stem® line offers a range of configurations for facilities that need dependable temperature […]

T150 High Precision Temperature Field Calibrator: Handheld Accuracy for the Shop Floor

When temperature measurement is critical to a process, calibration cannot be an afterthought. Temperature indicating devices need to be checked regularly to confirm they are still providing reliable readings, and that often means bringing calibration capability directly to the equipment. The Wahl T150 High Precision Temperature Field Calibrator is designed to do exactly that. Built […]

Celebrating 190 Years Together

Reaching 190 years is a milestone worth celebrating, and Palmer Wahl’s anniversary party gave our team the perfect opportunity to do just that. More than anything, the celebration was about bringing everyone together. Away from the usual rhythm of the workday, team members were able to relax, laugh, share stories, and enjoy time with the […]

Celebrating 190 Years: Palmer Wahl's Legacy of Precision and Innovation

At Palmer Wahl, we take pride in being one of America’s longest-running manufacturers, with a legacy that began in 1836 and continues today from our Asheville, North Carolina facility. For nearly 190 years, we have focused on designing and manufacturing highly precise temperature measurement tools that industries around the world rely on—from food processing and […]

190 Years of Precision: Celebrating Palmer Wahl’s Legacy

In 2026, Palmer Wahl marks an extraordinary milestone: 190 years as America’s first instrumentation company, proudly serving industry since 1836. This celebration is not about looking backward with nostalgia. It is about honoring a legacy that continues to shape how precision, reliability, and trust are defined in industrial measurement today. Where It All Began Founded […]

5 Hidden Costs of Inaccurate Pressure Measurement

In industrial environments where precision matters, small errors can lead to big consequences. Pressure gauges are often the unsung heroes of process reliability, yet when they’re even slightly off, the ripple effects can reach far beyond a single reading. From energy plants to chemical processing to manufacturing lines, inaccurate pressure measurement doesn’t just risk equipment […]

Custom Engineered Temperature Sensor Assemblies: Designed Around Your Process

Every industrial process is unique, and so are its measurement challenges. Off-the-shelf temperature sensors may work for routine applications, but when accuracy, durability, or speed of response is critical, you need a solution designed specifically for your environment. That’s where Palmer Wahl’s Custom Engineered Temperature Sensor Assemblies come in. Partnering With Our Engineers At Palmer […]

The Power of Customization: Build Your Own Digi-Stem® System

When it comes to precision temperature measurement, one size rarely fits all. Every process, plant, and application has unique requirements—from power supply and mounting constraints to environmental challenges and response-time expectations. That’s why Palmer Wahl designed the DST700 Wahl Digi-Stem® Advanced RTD Digital Thermometer with Data Logger and Optional Transmitter and Switch as part of […]

Easy Connect for DST700 Remote Probes

Our DST700 Wahl Digi-Stem® Advanced RTD Digital Thermometers feature Easy Connect connectors on all remote probes.  These M12 connectors make it simple to securely connect and disconnect the meter without removing the installed probe.  Straight and 90° Angle versions are available to fit the requirements of your installation.  Simply plug in and tighten the nut […]

Cleaning & Inspection Procedures for Differential Pressure Recorders

The DP Cell unit on Palmer Differential Pressure Recorders is made of Steel and has a safe working pressure of 2,500 psi.  The housing is secured with a quantity of 6 steel bolts of size 1/2-13 x 5.5. When using these instruments in applications where solids or semi-solids may accumulate inside the pressure housings, periodic […]

Shipping Damage Policy

Palmer Wahl endeavors to pack our customers’ products with the utmost care to ensure they arrive at their destination without damage. Sometimes, though, problems happen. Our policy below is to help customers get restitution in the event of a shipping damage issue.  Palmer Wahl cares about customers receiving the products they purchase and will support […]

Lithium Metal Battery Installation and Return Shipment Instructions

Download these instructions for printing Digi-Stem® DST300, DST400, DST500, DST600, DSP Series and the HSICBB-P Portable Ambient Blackbody units are powered by Lithium Metal Batteries. Transportation regulations require that products powered by Lithium Metal batteries are shipped without the battery installed, with the exception of the HSICBB-P, which has a power switch and must be […]

Calibrating Digi-Stem® Systems for use as Food Processing TID's

The United States Food & Drug Administration is "...responsible for protecting the public health by assuring the safety, efficacy, and security of human and veterinary drugs, biological products, medical devices, our nation's food supply, cosmetics, and products that emit radiation."  As a part of this mission, the FDA regulates the thermal processing of low acid […]

Thermocouples vs. RTDs

There are two basic types of electronic temperature sensors: thermocouples and resistance sensors (primarily RTDs and thermistors.) Thermocouples have much less mass in the sensor itself, and can be grounded - meaning the sensor actually touches the inside wall of its protective sheath, giving a much quicker transfer of heat energy - for a non-transmitting […]

TM and TMA Meters & Probes

Wahl TM Series meters ( TM612 and TM630) underwent a product line upgrade in 2016 that changed the standard connector on these meters. The original meters (part numbers TM612 an TM630) are dark gray and blue, with a light gray protective rubber boot.  They feature a M8x1, 4 pin connector.   The current meters (part […]

Choosing the correct Digi-Stem® Meter for your application

Need help choosing the correct Digi-Stem® Meter for your application? Digi-Stem® Digital Temperature Meters are available with different measuring technologies and configurations to meet the needs of your application. Models are available in Thermocouple and RTD varities, with or without transmitters. Specialty models are available for Intrinsically Safe applications, and where Max-Min temperature recording is […]

Visit us at IFTPS 2024 in Nashville, TN!

Palmer Wahl will once again be attending the IFTPS annual meeting (Institute for Thermal Processing Specialists), to be held this year in Nashville, TN.  Happening March 12 - 14 at the Lowe's Nashville Hotel, Palmer Wahl will be there with our DST600 Digi-Stem® RTD Meters for retorts, as well as our new DSP Digi-Stem® Advanced […]

Our NEW Digi-Stem® Advanced Digital Process Pressure Gauge

Our new DSP Digi-Stem® Digital Pressure Gauge is an Advanced Digital Pressure Gauge for use in industrial processes. An extension of our perenially popular Digi-Stem® Process Thermometers utilizing the same rugged and durable housing, the DSP offers precision and durability in pressure measurement.   Key Features of the DSP Advanced Digital Pressure Gauge: Accuracy and […]

Infrared Temperature: How It Works

Are you interested in how Infrared Temperature Measurement works? Are you trying to understand the physics behind the process? Wahl Instruments invented portable handheld infrared temperature measurement with our Heat Spy series.  Our expertise in infrared means we know it inside and out - and we're happy to share our knowledge! Watch our Seven Part […]

Visit Us At AISTech 2024 in Columbus, OH!

Palmer Wahl will be displaying in Booth 3052 at the upcoming AISTech event in Columbus, OH! Held at the Greater Columbus Convention Center May 6 - 9, 2024.  The Premier Technology Event for the Steel Industry, Palmer Wahl will be showcasing our Non-Contact Temperature Sensors (both Fixed and Handheld), as well as our High Temperature […]

Mercury Restrictions

Restrictions of Mercury Added Products A number of US states and foreign countries prohibit the use of mercury in their territories.  These include: California Connecticut Illinois Louisiana Maine Massachusetts Michigan Minnesota New Hampshire New York Ohio Rhode Island Vermont Washington Wisconsin Canada This list is subject to change without notice.  Make sure you know the […]

Sanitary Flanges

Sanitary Flanges are installed for use on a piece of pipe, using a Tri-Clamp hygenic fitting connection to make cleaning quick and easy. The most important part of choosing a Sanitary Flange and Tri-Clamp fitting for your installation is selecting the correct size Sanitary Flange for your application. Remember, the size of the flange is […]

Certificates of Conformance

Palmer Wahl offers a standard Certificate of Conformance on the bottom of each packing list, included with your order when it ships.  The standard Certificate of Conformance looks like this: Sometimes more information is required.  If so, we also offer a Long Form Certificate of Conformance, available for an additional charge.  The Long Form Certificate […]

Types of Thermocouples

A wide variety of thermocouple types exist, each reading temperature by measuring a voltage generated by the difference between two dissimilar electrical conductors that form an electrical junction.  The voltage is generated as a result of the Seebeck effect, and is measurable to be interpreted into a temperature. Thermocouples are: Interchangeable, utilizing standard connectors Measure […]

Chart Recorder Mounting Styles

Palmer Circular Chart Recorders are available in five different case mounting styles.  Select the one most appropriate for your application. Reference the above dimensions for each mounting style sketch. Wall Mount Wall mount recorders come with hangers attached, allowing you to mount your recorder with 1/4 inch diameter screws, with the back of the box […]

Custom Designed Solutions

As the manufacturer, Palmer Wahl is able to provide our extensive experience to our customers.  Our personnel have years of experience in a variety of industries, with familiarity of an assortment of applications. Many of our existing products can be modified to meet special requirements, or we can work with you to create a product […]

Handheld Heat Prober Probe Connectors

Palmer Wahl offers an assortment of handheld probes to fit Thermocouple and RTD handheld meters.  Our Heat Prober Hand Held RTD probes have different connectors to fit our Heat Prober meters. Thermocouple Probes have the ANSI Mini-Connector for the appropriate thermocouple type of the probe. RTD probes are available with four different connectors: 4 Pin […]

How to Replace Expendable Tips on TC850 Series Dipstick Meters

view tc850 dipstick specs To connect tip upon receipt of tc850: Remove screws and carrier top to expose the meter, and remove. Insert the tip into the lance, and lock into place with 2 screws. Attach Chromel lead (with yellow jacket) to the + (positive) terminal of the connector Attach Alumel lead (with red jacket) […]

How to setup a Zero point Temperature Bath

The following information is an excerpt from "Reproducibility of the temperature of the ice point in routine measurements" published by the Commerce Department, National Institute of Standards and Technology (NIST), 1995.  The complete document is available on their website. A properly prepared ice bath is one that consists of a cylindrical Dewar flask (a typical […]

Electronic Sensors

Learn about the different types of electronic temperature sensing and how they work.

Palmer Pelican® Case Recorder

Palmer Circular Chart Recorders with Pelican® brand cases are available for Temperature, Pressure, Combination, and Test & Valve Recorders in both 8 and 12 inch cases.

Waste Management Solutions

Learn more about initiatives to reduce or eliminate Mercury from the waster stream Northeast Waste Management Officials Association - Interstate Mercury Education & Reduction Clearinghouse (IMERC)

Mercury Products, Batteries and Electronic Disposal

Palmer Wahl manufactures products that contain Mercury, Electronic components, and batteries.  Each of these have specific methods of safe disposal. Mercury Products, Batteries and Electronic Disposal Mercury Recycling (Redirects to heritage-enviro.com) Consumer Guide to Battery Recycling (Redirects to energy.gov) Electronics Donation and Recycling Guidance (Redirects to epa.gov)

Aluminum Case Chart Recorder Mounting Styles

Palmer Aluminum Case Circular Chart Recorders are available in temperature and pressure variations, with five different case mounting styles.  Select the one most appropriate for your application. Reference the above dimensions for each mounting style sketch. Wall Mount Wall mount recorders come with hangers attached, allowing you to mount your recorder with 1/4 inch diameter […]

CP Numbers, D Numbers, and PW Numbers

Are you trying to locate a part you already have?  Palmer Wahl's engineering team creates special designs  If your part number begins with C, DP, or PW it is likely a special product that was custom designed for you.  If you need help identifying one of these parts, please contact us.

Standard Metal Quick Disconnect Connectors

Digi-Stem® Quick Disconnect

Many of our Digi-Stem thermometers are available with Remote Probes to allow for installation in a variety of applications.  We offer two different types of Straight Quick Disconnect connectors:  standard (metal) quick disconnect hardware and thermoplastic polyurethane quick disconnectors.  Both connectors are IEC IP67 Rated. Please note that cables with molded connectors are made to […]

Calibrating a Digi-Stem® DST600

Palmer Wahl offers DSTCAL software for the calibration of our Digi-Stem DST600 units.  Watch below to see a demonstration performed by our product expert, Jim Eldridge, to learn more.

Temperature & Pressure Chart Recorders

Calibrating a Palmer Pressure Recorder

From time to time your Palmer Pressure Recorder may require calibration.  Watch this video for a hands-on demonstation on how to do it with our Product Supervisor, Kim Banks.

USDA Equipment Acceptance

USDA Equipment Acceptance Certificate for the DST600, DST500, and DSX500. Complance with NSF/ANSI/3-A-14159-1-2019 (Hygiene Requirements for the Design of Meat and Poultry Processing Equipment). View Certificate

DST500 for Freezer Use

Midwest Food Processing Company Reduces Costs, Increases Processing Speed, and Improves Measurement Accuracy with the Wahl Digi-Stem® LEARN MORE

Instructions for Reuniting Separated Mercury Columns

This information is excerpted from NBS Monograph 90 Mercury separations commonly occur as a result of exposure to shock and rough handling during shipment.  This condition can generally be corrected by carefully following the procedure below, which was developed by the National Bureau of Standards, the predecessor of NIST: The National Institute of Standards and […]

How to Setup a Zero Point Ice Bath

The following information is an excerpt from "Reproducibility of the temperature of the ice point in routine measurements" published by the Commerce Department, National Institute of Standards and Technology (NIST), 1995.  The complete document is available on their website. A properly prepared ice bath is one that consists of a cylindrical Dewar flask (a typical […]

Liquid Actuated Remote Reading Dial Thermometer Bulbs

We offer both Mercury and Liquid actuated temperature systems in our Rigid & Remote Dial Thermometer systems.  Find drawings and descriptions of the liquid actuated temperature bulb styles available below. 81 Series Remote Bulbs for Remote Reading Dial Thermometers - Liquid Actuated 1B Liquid Filled Case Compensated Thermal System. These temperature systems are filled with […]

Mercury Actuated Remote Reading Dial Thermometer Bulbs

We offer both Mercury and Liquid actuated temperature systems in our Rigid & Remote Dial Thermometer systems.  Find drawings and descriptions of the temperature bulb styles available below. 51 Series Remote Bulbs for Remote Reading Dial Thermometers - Mercury Actuated 5B Mercury Filled Case Compensated Thermal Systems For ranges over 500°F mercury is used in […]

Temperature Recorder Bulbs

Temperature bulbs for temperature chart recorders are available in the different configurations shown below. Note: All mercury filled systems conform to ASME 5B.  Non-mercury systems conform to 1A with capillary over 30 feet and 1B with capillary under 30 feet.  Mercury and Non-Toxic filled systems are constructed of 304 stainless steel and have a maximum […]

DST600 With Rigid 1/4 inch Stem

FDA Final Rule 21 CFR Part 113

Title 21 of the US Code of Federal Regulations concerns the FDA department of Health & Human Services and how they regulate food for human consumption.  Part 113 of the title specifically concerns Thermally Processed Low-Acid Foods packaged in hermetically sealed containers. Visit the Electronic Code of Federal Regulations, Title 21 page for more information. […]

Transmitter for Pet Food Processing

Transmitter for Pet Food Processing U.S. Pet Food Processing Company uses Wahl Transmitters to increase measurement accuracy for safe and healthy dog food! LEARN MORE