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In temperature calibration laboratories, accuracy, stability, and repeatability are non-negotiable. Whether you are verifying industrial thermometers, calibrating resistance temperature detectors (RTDs), or checking thermocouples, your calibration equipment must meet the highest precision standards.
Dry-block calibrators have become a preferred choice for many labs and field technicians because they provide a stable, controlled heat source without the mess or maintenance demands of liquid baths. They are compact, portable, and capable of achieving a wide range of temperatures with fast heating and cooling cycles.
In this guide, we’ll explore the best dry-block calibrators for temperature labs in 2025, discuss what features to look for, and provide direct links to product categories and examples to help you make an informed purchase.
What Is a Dry-Block Calibrator?
A dry-block calibrator (also known as a dry-well calibrator) is an instrument used to generate stable temperatures for calibrating temperature sensors. Instead of using fluids, it employs a solid metal block with drilled holes where sensors are inserted.
Key Advantages:
Clean Operation – No oils or fluids that require disposal or maintenance.
Fast Temperature Cycling – Quickly heats and cools for faster calibrations.
Portability – Suitable for both laboratory and field work.
Wide Temperature Range – From sub-zero to over 1,000°C depending on the model.
Top 5 Dry-Block Calibrators for Temperature Labs in 2025
1. Fluke 9142 Field Metrology Well
The Fluke 9142 is known for its exceptional stability and portability, making it ideal for field and lab use.
Key Features:
Temperature range: –25°C to 150°C
Stability of ±0.01°C
Lightweight and portable (under 8 kg)
Best For: Field technicians who require lab-grade accuracy.
Explore more: Temperature Calibrators Category
2. Ametek JOFRA CTC Series
A trusted option in industrial calibration labs, the CTC Series offers fast heating/cooling with robust durability.
Key Features:
Wide temperature range: –25°C to 650°C (depending on model)
Easy-to-use color display and intuitive menu system
Rugged housing for demanding environments
Best For: Industrial labs needing a reliable, all-round calibrator.
3. Isotech Fast-Cal Dry-Block Calibrator
The Fast-Cal is designed for rapid deployment and fast calibration cycles.
Key Features:
Heats and cools quickly for high productivity
Compact and durable for portability
Multiple insert options for different probe diameters
Best For: Technicians working on multiple probe types daily.
4. Additel ADT875-1210 High-Temperature Dry Well
For extreme high-temperature calibration, the ADT875-1210 is unmatched.
Key Features:
Temperature range: 100°C to 1210°C
Stability of ±0.05°C
Suitable for thermocouple calibration in harsh industrial environments
Best For: High-temperature applications such as metal processing.
5. Fluke 9190A Ultra-Cool Field Metrology Well
A unique low-temperature dry-well calibrator, ideal for cold chain and cryogenic applications.
Key Features:
Temperature range: –95°C to 140°C
Stability of ±0.005°C
Designed for ultra-low temperature testing
Best For: Laboratories working with deep-freeze and cryogenic processes.
How to Choose the Right Dry-Block Calibrator
Temperature Range – Match the calibrator’s range to your sensor requirements.
Accuracy & Stability – The more precise your application, the higher the required stability.
Portability vs. Capacity – Smaller units are easier to carry but may hold fewer probes.
Interchangeable Inserts – Provides flexibility for different probe diameters.
Environmental Suitability – Consider ruggedness for field use versus lab-only designs.
Applications of Dry-Block Calibrators
Calibration of RTDs, thermocouples, and thermistors
On-site verification of industrial temperature sensors
Quality assurance in pharmaceutical, food, and chemical manufacturing
Research and development testing in engineering labs
Why Labs Prefer Dry-Block Calibrators in 2025
With modern designs offering faster warm-up times, improved stability, and lower maintenance, dry-block calibrators have become a mainstay in both labs and field environments. Their clean operation and ability to work in diverse conditions make them an ideal choice for temperature calibration professionals.
For more temperature calibration solutions, explore our Temperature Calibrators product range.
