Resources
Helpful information, FAQs, and technical resources for our customers
Technical Resources
Access technical information, guides, and best practices for calibration management.
View Resources →Frequently Asked Questions
What is NIST traceability?
NIST traceability means that our calibrations can be traced back to national measurement standards maintained by the National Institute of Standards and Technology through an unbroken chain of calibrations, each with documented uncertainty. This ensures confidence in measurement results.
How often should equipment be calibrated?
Calibration frequency depends on several factors including manufacturer recommendations, industry standards, regulatory requirements, equipment criticality, and usage patterns. Common intervals are annually, but some equipment may require more or less frequent calibration. We can help you determine appropriate intervals.
Do you provide on-site calibration?
Yes, we offer on-site calibration services for equipment that cannot be easily transported or must remain in place (such as large floor scales or installed hood systems). Contact us to discuss your on-site needs.
What is included in a calibration certificate?
Each certificate includes equipment identification, calibration date, as-found and as-left data, measurement standards used with their traceability, environmental conditions, measurement uncertainty, and due date (if requested). All certificates are digitally signed.
What is measurement uncertainty?
Measurement uncertainty quantifies the doubt that exists about a measurement result. It considers all sources of error including reference standards, measurement procedures, environmental conditions, and equipment limitations. We evaluate and report uncertainty for all calibrations.
Can you calibrate out-of-tolerance equipment?
Yes, we calibrate and document the as-found condition of equipment even if it's out of tolerance. If the equipment is adjustable and you authorize us, we can attempt to bring it within specifications. The certificate will show both as-found and as-left conditions.
Do you offer rush or same-day service?
Yes, expedited service is available for many types of equipment. Rush service (1-2 business days) and same-day service are offered based on availability and equipment type. Additional fees apply.
What payment methods do you accept?
We accept check, ACH transfer, and major credit cards. Terms are Net 30 for established accounts with approved credit. New customers may be asked to pay in advance or COD for initial orders.
Are you ISO/IEC 17025 accredited?
We are currently pursuing ISO/IEC 17025 accreditation and operate according to ISO/IEC 17025 principles. We maintain a quality management system, use NIST traceable standards, and evaluate measurement uncertainty for all calibrations.
Technical Resources
Calibration Best Practices
- Establish risk-based calibration intervals
- Maintain equipment identification and history
- Keep calibration certificates accessible
- Use calibrated equipment within its specified ranges
- Protect equipment from damage and contamination
- Document equipment usage and any damage
Preparing Equipment for Calibration
- Clean equipment before sending
- Remove any hazardous materials
- Include any necessary accessories or adapters
- Provide equipment ID and specifications
- Note any specific concerns or issues
- Pack securely for transport
Understanding Test Uncertainty Ratios (TUR)
TUR compares the uncertainty of the calibration to the tolerance of the equipment being calibrated. A TUR of 4:1 or higher is generally preferred, meaning the calibration uncertainty is 1/4 or less of the equipment tolerance.
If a 4:1 TUR cannot be achieved, the calibration may still be acceptable with appropriate justification and documentation.
Calibration Interval Optimization
Calibration intervals should balance risk and cost. Consider these factors:
- Historical performance and drift rates
- Manufacturer recommendations
- Regulatory or industry requirements
- Criticality of measurements
- Usage frequency and environment
Calibration Glossary
| Term | Definition |
|---|---|
| Calibration | The comparison of a measurement device to a known standard to determine accuracy |
| Traceability | An unbroken chain of calibrations back to national or international standards |
| Uncertainty | A parameter characterizing the dispersion of values attributed to a measurement |
| As-Found | The condition of equipment before any calibration adjustments are made |
| As-Left | The condition of equipment after calibration and any necessary adjustments |
| Tolerance | The permissible deviation from a specified value |
| Accuracy | The closeness of agreement between a measurement and the true value |
| Resolution | The smallest increment that can be detected or displayed by an instrument |
Downloads
Calibration Request Form
Use this form to submit equipment for calibration. Include all necessary details for accurate processing.
Contact us to request form
Service Capabilities Sheet
Detailed information about our calibration capabilities, ranges, and uncertainties.
Contact us to request sheet
Sample Certificate
View a sample calibration certificate to see what information is included in our reports.
Contact us to request sample