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Welcome to Castletronics

Refurbished, NIST-Calibrated Test & Measurement Equipment: Your trusted source for refurbished, precision test and measurement instruments. Located in Castle Rock, CO, we specialize in restoring, calibrating, and certifying devices from top brands like Keithley, Agilent, and Keysight to meet NIST-traceable standards.

Explore precision multimeters, sourcemeters, signal generators, and essential servicing tools, components and supplies — fully tested and backed by transparent policies and support.

  • ✅ NIST-Calibrated Instruments
  • ✅ Trusted Brands: Keithley, Agilent, Keysight
  • ✅ Fully Tested & Guaranteed Performance
  • ✅ Competitive Pricing & Fast Shipping

Test and Measurement | Electronic Supply | Colorado
Keithley | Tektronix | Agilent | Keysight | Universal counters | Multimeters | Signal Generators | Sourcemeters

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