Service and Guarantees for Calibration and Adjustment


Because it verifies the condition of an instrument, calibration is like a health checkup. Specifically, the process involves checking the condition of an instrument at a particular point in time by comparing the ideal value indicated by a standard and the value indicated by the instrument being calibrated.

Warranty period for calibration

Hioki guarantees its calibration work. There is no set warranty period. Values as of the date of calibration are provided as calibration results. Consequently, the period of time over which the calibration is considered valid must be determined by the customer.

Calibration interval

Hioki recommends that each product’s accuracy guarantee period be treated as the recommended calibration interval.


In adjustment, an instrument is corrected so that its indicated value more closely approximates the ideal value. Hioki recommends that adjustment be performed in conjunction with calibration as a process that allows the instrument to perform closer to ideal values. Products that have undergone adjustment carry a Accuracy guarantee period after adjustment made by Hioki.

Even though the values indicated by an instrument may fall within tolerance at the time of calibration, they may subsequently fall outside that range.

By performing adjustment at the time of calibration, any deviation from the ideal value can be corrected, reducing the risk that values indicated by the instrument will subsequently fall outside the tolerance levels.

Guarantees for adjustment

Each product has a designated accuracy guarantee period after adjustment made by Hioki.
With the exception of some products, Hioki offers an accuracy guarantee period after adjustment for the duration of the recommended calibration interval. The guarantee period is considered to start in the month and year in which adjustment was performed.

Guarantee conditions

  • Accuracy guarantee period after adjustment made by Hioki is a guarantee of the accuracy of measured values. It is not a product warranty.
  • In the event the instrument falls out of accuracy due to part service life or degradation, a fee will apply to the repair.
  • In the event the instrument falls out of accuracy due to damage or questionable operating or storage conditions, a fee will apply to the repair.
  • If we conclude that a product received from a customer is likely to fall out of accuracy after shipment, we may contact the customer and decline to provide an accuracy guarantee period after adjustment made by Hioki.

For service capability and warranty period, please see the page below.

Service Information by Product

For more information about calibration and adjustment, please contact your authorized Hioki distributor or reseller.

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Documents Hioki can issue:

Hioki can also issue the following documents upon request:

  • Reference standard calibration data

    Set of calibration documentation for Hioki’s top-level standards (which are linked to standards at external organizations)

  • Intermediate standard calibration data

    Set of standard calibration data lying between applied standards and comparative standards

  • Utilized standard calibration data

    Set of calibration data for standards used to calibrate Hioki products

ISO/IEC 17025 calibration (JCSS)

Hioki Headquarters is an international MRA-cmpliant, JCSS-accredited calibration service provider that meets ISO/IEC 17025 requirements. As such, we can issue JCSS calibration certificates bearing the international MRA-compliant JCSS mark, which means they are recognized worldwide.

JCSS calibration and international MRAs

JCSS is a registration program designed to ensure that calibration service providers possess the technological skills needed to perform calibration that complies with measurement-related laws and the requirements imposed by ISO/IEC 17025.

Registered service providers are entitled to perform JCSS calibration and issue calibration certificates bearing the JCSS symbol mark. Such certificates serve as evidence of the calibration service provider’s technological skills and traceability. JCSS calibration service providers who have been certified as international MRA-compliant can issue calibration certificates bearing the ILAC-MRA and IA Japan symbol marks. Such certificates can be used as official documents whose validity is recognized worldwide.

International MRAs

An MRA is a mutual recognition agreement. IA Japan belongs to ILAC and APLAC. Calibration certificates issued by calibration service providers that have been certified as MRA-compliant by IA Japan are treated as equivalent to calibration certificates recognized by member certification entities in member countries.

  • [MRA: Mutual recognition agreement] JCSS (Japan: IA Japan) → UKAS (UK) / DAkkS (Germany) / NATA (Australia) / NVLAP, A2LA (U.S.A.) | ILAC [UKAS (UK) / DAkkS (Germany) / JCSS (Japan: IA Japan) / NATA (Australia) / NVLAP, A2LA (U.S.A.)], EA [UKAS (UK) / DAkkS (Germany)], SADCA, APLAC [JCSS (Japan: IA Japan) / NATA (Australia) / NVLAP, A2LA (U.S.A.)], IAAC [NVLAP, A2LA (U.S.A.)]

ILAC: International Laboratory Accreditation Cooperation
APLAC: Asia Pacific Laboratory Accreditation Cooperation
IAAC: Interamerican Accreditation Cooperation
EA: European Cooperation for Accreditation
SADCA: Southern African Development Community Accreditatio

When is JCSS necessary?

JCSS calibration is the solution when you need calibration that includes inaccuracy data, for example ISO/IEC 17025 calibration, ILAC calibration, MRA calibration, or IATF 16949 calibration.

Specific examples:

  • Calibration of instruments used by automobile (or motorcycle) manufacturers and part suppliers
  • Calibration of instruments used in UL product certification
  • Calibration of instruments as required by Japanese law (for radiation therapy) or ministerial ordinance (for pharmaceuticals and quasi-drugs)