The Manufacturer of Handheld Process Calibrators for Milliamp, Thermocouple, RTD, Frequency, Voltage & Pressure

Process Calibrators

Simplify your day-to-day calibration tasks with a PIE Process Calibrator

I & E technicians use a process calibrator to do more and more every day with less help and shrinking budgets! PIE Process Calibrators help you simplify your job with calibrators that are technician friendly. They are compact, easy to learn, simple to setup and highly accurate. And PIE is the home of the only calibrators with patented Loop Diagnostic Technology!

PIE technician friendly calibrators are all about ease of use. PIE’s unique and intuitive EZ-DIAL Double Click Menu makes them simpler to setup than larger calibrators with their complicated button filled panels and confusing menus. Use a PIE right out of the box instead of wasting time trying to learn to use more complex calibrators.

Technician suggested evolutionary design

PIE Calibrators include features requested by I & E technicians. From simple thermocouple and RTD sources to multifunction calibrators PIE has what you are looking for at a price to fit your budget.

Process Calibrators to checkout the instruments in your plant

When you need to source, read or simulate a process input or a control signal PIE has a process calibrator to fit your need. Thinking of buying a milliamp calibrator or loop calibrator? Our range of calibrators is wider than any other manufacturer. Choose a thermocouple calibrator or RTD calibrator for your temperature instrumentation and a frequency calibrator for all your flow applications. Our voltage calibrator is great for 1 to 5 volt and 0 to 10 volt inputs plus it can simulate a pH probe into your pH transmitters and analyzers. If you prefer a multifunction calibrator we have basic models with a single display to a dual display model with advanced troubleshooting features.

Looking to replace an obsolete Altek calibrator* or Transmation calibrator*?

A PIE Calibrator is designed and built by members of the same team that created the calibrators now manufactured by Fluke* under the Altek* label. We have been designing calibrators since the 1980s and for PIE since 2001. Improvements include simple “Double Click Menu”, rubber boot with tilt stand and optional magnet strap, backlit displays with larger digits, rugged switches and battery compartments for fast battery changes. PIE has upgraded replacements for the Altek Multifunction Process Calibrator 820, and Altek 830 Process Calibrator, Altek RTD Calibrator 311A and 211, Altek Thermocouple Calibrator 422 and 322-1, Altek Process Voltage Analyzer 235, and the Altek 4-20 Milliamp Calibrator 334, 334A and 434. The PIE Model 535 is the perfect replacement for the Transmation 1040 and Transmation 1080 for 10-50 milliamp loops.

Support when you need it anywhere in the world

Each PIE Process Calibrator is designed, assembled and calibrated in the USA from components sourced from around the world.  All PIE calibrators are calibrated in Webster, NY using equipment traceable to NIST. Unlike some other calibrators that only include a statement of calibration practices, PIE Calibrators come standard with a Certificate of Calibration and a Three Year Warranty! We recommend annual recalibration of our products. Contact PIE or your local distributor for factory recalibration. Calibration may also be performed by your company’s calibration laboratory or any of your qualified calibration vendors. Calibration procedures are posted on our website.


A current leakage in a process loop, sometimes referred to as a ground fault condition, can be one of the most difficult and frustrating problems to diagnose. Often caused by incorrect grounding, corrosion or moisture, a current leakage will appear as a zero shift in calibration of the loop transmitter. Using a Loop Diagnostic Calibrator from PIE allows you to instantly read this current leakage. This will save you hours of unnecessary calibration and troubleshooting. Check out our videos for a  demonstration of Loop Diagnostics in action.