A metal detector and x-ray inspection system test fob is a key fob-style test standard that contains a precision sphere (ferrous, non-ferrous, stainless steel, soda lime glass, alumina ceramic, or porcelain) embedded in FDA-compliant plastic. The compact, portable design allows operators to carry it on a keychain or lanyard for convenient spot checks throughout their shift.

Test fobs work by passing through metal detectors or X-ray systems to verify they're functioning correctly. Each fob is NIST traceable with a specific ball size (0.25mm to 5.0mm) and comes with a Certificate of Conformity. The fob should trigger the detector's alarm when passed through the inspection zone, confirming the system is working properly.

Key features: Color-coded for easy size identification, imprinted with ball size and CoC number for traceability, integrated keyring loop for secure attachment, reusable with no expiration date, and professional appearance suitable for audits.

The main difference is portability and convenience. Test fobs are designed with a keyring loop for carrying on keychains, or lanyards, making them ideal for operator-level spot checks. Test cards are flat, credit card-sized pieces typically stored in a QC office for scheduled testing by quality control staff.

When to Use Each:

• Test Fobs: Operator spot checks, multi-line supervision, shift start verification, post-maintenance testing, when portability is essential
• Test Cards: Scheduled QC testing, comprehensive documentation, when testing multiple sizes, budget-conscious operations

Both are NIST certified with identical accuracy. Many facilities use both types - cards for QC department scheduled testing and fobs for operator convenience throughout the day.

The correct test fob size should match your metal detector's sensitivity settings and your product characteristics. The easiest method is to match the size of test cards you currently use - if you validate with 2.5mm cards, order 2.5mm fobs.

Quick Size Guide:

• 1.5mm: Small/dense products, high sensitivity systems
• 2.0mm: Standard small to medium products
• 2.5mm: Most common size for typical applications
• 3.0mm: Medium to large products
• 3.5mm: Large products, less sensitive systems

Not sure? Contact us with your product size and detector model - we'll recommend the appropriate test fob size. Many facilities keep multiple sizes for different production lines.

Yes! Test fobs are completely reusable with no expiration date. The precision spheres inside are permanent and maintain their exact size indefinitely. Once you purchase a test fob, you can use it for years without replacement or recertification.

Why They Don't Expire:

• Stable Materials: The metal balls (ferrous, non-ferrous, stainless steel) are dimensionally stable and don't corrode, oxidize, or change size over time
• Permanent Enclosure: Unlike embedded wire test pieces that can shift or break, the precision balls are permanently sealed in FDA-compliant plastic during manufacturing
• Physical Properties: Metal spheres are solid state materials that maintain their exact dimensions indefinitely under normal use conditions

One-Time Investment: Each fob is a one-time purchase that provides unlimited testing over its lifetime. With proper care, expect 3-5 years of daily use before normal wear might warrant replacement.

When to Replace: The only reasons to replace a test fob are: physical damage to the plastic housing (cracks, breaks), loss of the fob itself, or if imprinted markings become illegible. The metal test pieces themselves never need replacement or recertification.

Absolutely! Test fobs work for both metal detectors and X-ray inspection systems. The dense metal spheres inside create clear, distinct images on X-ray screens, making them ideal for verifying X-ray system sensitivity and image quality.

X-ray Testing Benefits:

• Dual Functionality: One test standard validates both metal detection and X-ray inspection systems
• Distinct Imaging: The three different metal types (ferrous, non-ferrous, stainless) show distinct contrast levels on the X-ray image
• Sensitivity Verification: Small ball sizes (1.5mm-3.5mm) confirm your X-ray system can detect small contaminants
• Image Quality Check: The spherical shape and known size help verify image clarity and system calibration

Cost-Effective Solution: This dual functionality makes test fobs a versatile, cost-effective solution for facilities with multiple inspection technologies. Instead of purchasing separate test pieces for each system type, one test fob serves both purposes.

Yes! Every test fob includes comprehensive certification documentation that satisfies third-party auditors and regulatory requirements:

Included Documentation:

• Certificate of Conformity (CoC): Each fob has a unique certificate number imprinted on the plastic body
• NIST Traceability: Certification that the precision balls are Grade 200 and traceable to NIST standards
• Material Compliance: FDA food contact approved plastic material documentation
• Ball Size Documentation: Certified dimensions for all three metal types (ferrous, non-ferrous, stainless steel 316)
• Imprinted Identification: Each fob permanently displays its CoC number and ball size for easy field verification

Audit Compliance: This documentation satisfies requirements from third-party auditors including BRC, SQF, FSSC 22000, and other GFSI-recognized food safety certification bodies. The permanent imprinting on each fob allows operators to verify traceability without needing to access separate paperwork during production.

Certificate Management: Certificates are downloadable from our website using your unique CoC number. Keep a copy in your quality management system files for auditor review. The imprinted CoC number on the fob itself provides instant verification that the test standard is certified and traceable.

Test fobs can be shared among operators, but individual assignment is recommended for several operational and quality management reasons:

Benefits of Individual Assignment:

• Accountability: Individual ownership increases responsibility for proper use and care of the test fob
• Availability: Operators always have immediate access without searching for a shared fob or waiting for others to finish using it
• Loss Prevention: Attached to personal items (keychain, badge), individual fobs are less likely to be misplaced than shared fobs in common areas
• Hygiene: Personal fobs eliminate concerns about shared handling in food production environments
• Training Aid: New operators learn proper testing procedures with their own assigned tool

Practical Approach: Best practice is to issue individual fobs to operators and supervisors who regularly need to verify metal detector performance, while keeping 1-2 shared fobs in the QC office as backups for temporary workers or emergencies.

Department Sets: Many facilities purchase department sets of 5-10 fobs to equip their entire team. This investment is modest compared to the value of preventing contamination escapes due to undetected equipment malfunctions.

Test fobs are particularly valuable in facilities with multiple production lines where supervisors move between lines throughout the day and need convenient verification capability without returning to a central QC office.

Test fobs are used across any industry requiring HACCP compliance and foreign material control:

Industries:

• Food Manufacturing & Processing: Bakeries, meat processing, snack foods, beverage, dairy, frozen foods, confectionery
• Pharmaceutical & Nutraceutical: Tablet manufacturing, capsule filling, vitamin production, supplement packaging
• Cosmetics & Personal Care: Powder products, creams, lotions, makeup manufacturing
• Pet Food Manufacturing: Kibble, treats, wet food, raw food production
• Contract Manufacturing: Co-packers and private label producers serving multiple clients

Common Applications:

• Shift Start Verification: Operators test metal detectors before production begins
• Post-Maintenance Checks: Immediate verification after equipment service or calibration
• Multi-Line Supervision: Supervisors quickly verify multiple production lines during rounds
• Operator Spot Checks: Random verification throughout the production shift
• Training Demonstrations: Teaching new employees proper testing procedures
• Audit Preparation: Quick system verification before third-party auditor visits

Regulatory Requirement: Most food safety standards (SQF, BRC, FSSC 22000) require documented metal detector verification at specified intervals. Test fobs enable operators to meet these requirements efficiently throughout their shift without disrupting production flow.