Crystal Engineering / Ametek Calibration

AMETEK Sensors, Test & Calibration is one of the world’s leading manufacturers and developers of calibration instruments for temperature, pressure and process signals as well as for temperature sensors both from a commercial and a technological point of view.

  • Calibration of Pressure, Temperature and Signal Instruments
  • N Vision digital Pressure, Temperature and Signal gauge that can recorder data
  • XP2i Digital Pressure Gauge that can record data
  • Dry Block Temperature Calibrators

Ralston Engineering


We provide complete pressure calibration solutions for a wide range of applications both in the laboratory and in the field. All of our products are designed to save time and eliminate the guesswork that often accompanies critical pressure testing, maintenance, and repair Why Choose Ralston Instruments?

  • 50 years of experience
  • Made in the USA
  • ISO 9001:2015 certified company
  • Advanced manufacturing techniques
  • User-oriented design features
  • Quality calibration solutions and hand pumps
  • Reliable service



MAXPRO® Technologies Inc. has served as the exclusive North American distributor for Maximator® high-pressure air-driven liquid pumps, gas boosters, air amplifiers, valves, fittings, and tubing for over 25 years. Maximator is recognized for its industry-leading high-pressure solutions. In addition to our broad selection of standard products and systems, our team leverages engineering expertise and in-depth understanding of high-pressure systems to design custom solutions for unique, specialized applications.

High-pressure equipment must be able to withstand demanding requirements without compromising safety while providing top performance. Typical examples include liquid pumps, gas boosters, air amplifiers and system components such as valves, fittings, and tubing.

Quality Manufacturers

We work with quality manufacturers for the best test and calibration equipment on the market. We bring these excellent products to the oil and gas industry for North Dakota and Montana.

Manufacturers Represented:

  • Crystal Engineering
  • MaxPro Technologies
  • Ralston Instruments
  • Barton Chart Recorders
  • TechCal Chart Recorders
  • Spy Jeep Detectors
  • Ametek Test & Calibration
  • NoShok
  • Rice Hydro
  • ThermoProbe
  • Knapp Poly Pigs
  • PIE (Practical Instrument Electronics, Inc.)
  • Reotemp Instruments
  • ThermoProbe Inc.
  • SuperLok USA Valves and Fittings
  • Tinker & Rasor