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Factory certificate

We offer you a factory certificate for our temperature probes in our store.

You can find all the important information here

  1. Factory certificate and factory declaration
  2. TSG factory certificate
  3. Factory calibration versus factory certificate and factory declaration


Factory certificate and factory declaration

In simple terms, a factory certificate is the manufacturer's confirmation that the product ordered by the customer from the manufacturer has been tested by the manufacturer and corresponds exactly to what the customer ordered. The emphasis in this sentence is on "tested". The manufacturer himself decides what exactly he tests and how he tests it. Based on the factory certificate, the customer can be sure that the manufacturer has actually carried out a test and that the product he receives corresponds to what he, i.e. the customer, ordered in advance.

A factory declaration, on the other hand, does not include the test, but merely confirms in writing that the customer actually receives the product with the required properties as ordered.

To put it bluntly, a factory certificate is not quite as reliable as a works certificate.


TSG factory certificate

We measure our temperature probes with a factory certificate as follows:

For the factory certificate, we use a block calibrator or a calibration bath, depending on the type.

The calibrators and the reference sensors are calibrated once a year.

You can download a sample of our factory certificate here.

We offer the following measurements as standard:

  • 3-point measurement (25 °C, 60 °C, 100 °C)

If you require a 1- or 2-point factory certificate or the factory certificate for other measuring points, please feel free to contact us directly.

We offer a factory certificate for the following items:

Screw-in probes with G1/2", G1/4" and G3/8" (from 100 mm mounting length)

Cable probes with sleeve (only with 5 mm and 6 mm diameter)


Factory calibration versus factory certificate and factory declaration

Different terms are often confused in this context and the differences are not always clear. Let's first take a look at the topic of "calibration":

Put simply, a calibration is the comparison of a measured value of the test item to be calibrated with the measured value of a reference. For this purpose, measured values of the test specimen and the reference are recorded and compared simultaneously under previously defined conditions. The reference, or more precisely, the measuring equipment used as a reference, must obviously work as accurately as possible, at least significantly more accurately than the test specimen to be calibrated, so that calibration makes sense at all.

In simple terms, this means that the measured values of the reference should be significantly closer to the "truth" than the test specimen is capable of measuring. The reference itself is also not "infinitely" accurate, but must also be calibrated against an even more accurate reference. And so on, and so on; ultimately, every reference, i.e. every measuring device, can be traced back to an "absolute reference", e.g. a reference from the PTB, i.e. the Physikalisch Technische Bundesanstalt, which by definition can be assumed to be "sufficiently absolutely accurate".

The deviations of the measured values of the test specimen from those of the reference and also the conditions under which the calibration was carried out are documented and recorded in a calibration report, a DAkkS calibration certificate or a factory/ISO certificate.

The contents and differences between these three documents are clearly compared in the following table


Specification of the measured values Calibration protocol Factory/ISO calibration certificate Calibration certificate with accreditation symbol ("DAkkS calibration certificate")
using the example of Testo SE & Co. KGaA without normative basis. using the example of Testo Industrial Services GmbH free according to ISO 9001:2015 / ISO 10012:2003 (7.1.4) of all accredited calibration laboratories according to ISO/IEC 17025:2018
Specification of the measured values Depending on the measurand, multiple measurements of the individual calibration points; in this case, specification of the average value transmitter of the measurements or all individual measured values.
Description and unique identification of the calibrated measuring equipment Device, Type, Serial number Device, probe, Type Serial number, inventory number, equipment number Device, probe, Type Serial number, inventory number, equipment number
Calibration date
Calibration results obtained AFTER or BEFORE an adjustment or repair only indication of the individual measurement, even if adjustment has been made Pre- and post-certificate Pre- and post-certificate
Identification of the measurement/calibration procedure
Traceability of the calibration Metrological traceability to recognized standards is guaranteed, but this is not traceable via the calibration protocol. The standards/references used are metrologically traceable and can be traced via the calibration certificate The metrological traceability of the measurement results and the standards/references used is guaranteed and can be traced via the calibration certificate.
Ambient conditions
Identification of the operator and the conductor In some cases, only the designation of an inspector number with (**) Indication of the editor and person responsible Indication of the processor and calibration laboratory manager
Specification of the measurement uncertainties
Certificate number Consecutive numbering Measured variable letter + consecutive number + date (MM-YYYY)
Permissible deviation is referred to here as tolerance If applicable, implicit indication of origin "Manufacturer's specification" or similar
Individual restrictions
Information on (recommended) recalibration date The calibration laboratory does not recommend a recalibration date. A recalibration date can be printed at the customer's request. The user is responsible for adhering to an appropriate recalibration period.
Name + address of the customer
Statement of conformity Only indication of the individual measurement, even if adjustment has been made Depending on the customer agreement
Name, address and accreditation number of the laboratory No indication of the laboratory performing the measurement Name + address yes, but no accreditation number
National accreditation body and registration number
Number of certificate pages
Place of calibration
Note that the certificate may only be passed on in printed form without the permission of the laboratory
Note on regulation Calibration reports are not subject to any regulation and there is no normative basis for their creation. As a rule, they contain less information than a calibration certificate. Such reports are usually issued with new devices and are more of a kind of goods issue bill. Even the term "certificate of conformity" is often misleading, as no conformity is checked. ISO calibration certificates are generally not subject to any external quality control other than critical examination by the customer himself. The eponymous ISO 9001:2015 does not specify any requirements regarding the necessary content of the calibration certificates. Testo Industrial Services is based on ISO 10012:2003 - a kind of practice-oriented "auxiliary standard" that can be used to implement ISO 9001:2015. Calibration certificates with an accreditation symbol and the issuing accredited laboratories are subject to regular inspection and testing by the German Accreditation Body (DAkkS). The information that must be provided in a DAkkS calibration certificate is specified in ISO/IEC 17025:2018 and must be listed in the calibration certificate in accordance with the defined layout.