Digital Thermometers
Tel-Tru’s Digital Thermometers are designed to deliver reliable accurate readings in the toughest industrial environments. All models are built to order using our wide range of configurations, delivering customers exactly what they need.
Dial Thermometers
Tel-Tru designs and manufactures industrial thermometers and other quality industrial temperature instruments to improve quality and operational performance.
RTD Sensors
Check-Set® Thermometer Calibrators
Check-Set Calibrator Data Logger for traceable digital record keeping.
Check-Set Calibrator for fast, easy, and accurate verification.
Remo-Tel®
The Remo-Tel Industrial Temperature Monitoring System automates temperature data logging and provides a 24/7 online monitoring dashboard for industrial and commercial operations to help mitigate risk for product loss and system failure and improve productivity. The Remo-Tel System is ideal for a wide variety of processes including Refrigeration, Molding, Brewing and other extremely time sensitive temperature monitoring applications.
Thermowells
Thermowells for sanitary applications as well as thermowells that can be treated and documented to NACE standards. Thermowells are recommended for pressure, corrosive fluid, or high velocity applications. Produced using highest quality material and machined from solid bar stock for standard or high velocity requirements in a large selection of materials and coatings. Designed and manufactured to assure perfect alignment with the thermometer stem.
Glass Industrial
Our glass industrial thermometers are versatile and adjust-angle, with a lens front and red liquid fill. They are NIST calibrated and guaranteed accurate to ± one scale division.
Pressure Instruments

Digital Thermometers
Tel-Tru’s Digital Thermometers are designed to deliver reliable accurate readings in the toughest industrial environments. All models are built to order using our wide range of configurations, delivering customers exactly what they need.
Dial Thermometers
Tel-Tru designs and manufactures industrial thermometers and other quality industrial temperature instruments to improve quality and operational performance.
RTD Sensors
Check-Set® Thermometer Calibrators
Check-Set Calibrator Data Logger for traceable digital record keeping.
Check-Set Calibrator for fast, easy, and accurate verification.
Remo-Tel®
The Remo-Tel Industrial Temperature Monitoring System automates temperature data logging and provides a 24/7 online monitoring dashboard for industrial and commercial operations to help mitigate risk for product loss and system failure and improve productivity. The Remo-Tel System is ideal for a wide variety of processes including Refrigeration, Molding, Brewing and other extremely time sensitive temperature monitoring applications.
Thermowells
Thermowells for sanitary applications as well as thermowells that can be treated and documented to NACE standards. Thermowells are recommended for pressure, corrosive fluid, or high velocity applications. Produced using highest quality material and machined from solid bar stock for standard or high velocity requirements in a large selection of materials and coatings. Designed and manufactured to assure perfect alignment with the thermometer stem.
Glass Industrial
Our glass industrial thermometers are versatile and adjust-angle, with a lens front and red liquid fill. They are NIST calibrated and guaranteed accurate to ± one scale division.
Pressure Instruments


Temperature plays a critical role in both the firearm and ammunition industries, influencing manufacturing, performance, safety, and maintenance.
Proper temperature management ensures the integrity of materials, precision in manufacturing processes, and the reliability of firearms and ammunition in diverse operating conditions. Tel-Tru, a leader in temperature monitoring solutions; bimetal dial thermometers, digital thermometers, remote temperature monitoring systems and thermometer calibration devices support these industries with advanced equipment that enhances quality, safety, and efficiency.
If your filter selections require us to create a product to fit exact specifications, rest assured. For over 100 years we have built over 100,000 versions of our products. We will leverage that experience to build your product to exact specification with rapid turnaround using the RFQ results link.
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Temperature control is essential during heat treatment processes, where components like barrels and firing pins are subjected to precise heating and cooling cycles to achieve optimal hardness and strength. Tel-Tru’s temperature monitoring devices ensure accurate control during annealing, quenching, and tempering, preventing brittleness and ensuring durability. During machining and assembly, maintaining stable temperatures is crucial as metal expands and contracts with temperature changes. Tel-Tru’s solutions help maintain tight tolerances, ensuring components fit together perfectly, which is vital for the firearm’s performance and safety. Temperature instruments are also used to monitor lead pots and bullet heat treating.
Surface treatments such as bluing, anodizing, plating, and coating require precise temperature regulation to ensure consistent application and adhesion of protective layers. Tel-Tru thermometers are used by gunsmith professionals in Parkerizing Baths and processes like bluing to achieve the desired depth and uniformity, enhancing the firearm’s durability and appearance.
Tel-Tru’s instruments facilitate rigorous testing in controlled temperature environments, ensuring firearms function correctly in both arctic cold and desert heat, safeguarding performance and safety.
In the ammunition industry, temperature significantly affects the stability and performance of propellants and explosives. Excessive heat can degrade these materials, altering burn rates and performance, while low temperatures can reduce their reactivity. Tel-Tru’s precise temperature control during production ensures consistent quality and safety.
The production of casings and primers also requires strict temperature regulation during forming, annealing, and sealing. Tel-Tru’s monitoring devices maintain the integrity and reliability of these components, essential for high-quality ammunition.
Temperature impacts ammunition performance, including muzzle velocity, accuracy, and pressure. Higher temperatures increase pressure inside the cartridge, potentially leading to higher velocities but also more wear on firearms. Lower temperatures can reduce pressure and velocity, affecting accuracy.
Tel-Tru’s equipment ensures consistent testing across various temperatures, guaranteeing reliable performance under different environmental conditions.
Proper storage conditions are critical for maintaining ammunition safety and effectiveness. Tel-Tru’s remote temperature monitoring solutions ensure stable conditions during storage and transport, preventing degradation and ensuring longevity.
Regulatory compliance often mandates strict temperature control for ammunition production and storage. Tel-Tru’s reliable instruments help manufacturers meet these standards, ensuring safe and legal production practices.