#### Calibration Certificate

Certificat d'étalonnage

issued by the calibration laboratory

délivré par le laboratoire d'étalonnage

D-K-15209-01-00
Accredited Calibration Laboratory

##### Ghana Standards Authority

P. O. Box MB 245, Accra, Ghana

TEL: +233-302-500065/6 Fax: +233-302-500092

E-Mail: scientificmetrology@gsa.gov.gh

Certificate number | GSA/THL/2026/0001
Calibration mark | D-K-15209-01-00
| 2026-06

Object / Objet | thermo-hygrometer
Manufacturer / Fabricant | Elsmar Cove
Type / Type | 74BX0S89
Serial number | D4VAX234
Customer / Client | Noguchi Memorial Institute for Medical Research (NMIMR)
Order number | REQ-202606-0001
Number of pages | 2
Calibration date | 2026-05-21 TO 2026-06-02
Date of issue | 02 Jun 2026
Due date | 02 Jun 2026

This calibration certificate documents the metrological traceability to national standards, which realize the units of measurement according to the International System of Units (SI).

The DAkkS is signatory to the multilateral agreements of the European co-operation for Accreditation (EA) and of the International Laboratory Accreditation Cooperation (ILAC) for the mutual recognition of calibration certificates.

The user is obliged to have the object recalibrated at appropriate intervals.

Ce certificat d'étalonnage documente la traçabilité métrologique des grandeurs mesurées par raccordement aux étalons nationaux en conformité avec le SI.

This calibration certificate may not be reproduced other than in full except with the permission of the issuing laboratory.

Ce certificat d'étalonnage ne peut être reproduit que dans son intégralité.

Date of issue / Date

2026-06-02

Approved by / Approuvé par

Obed Agoe
Laboratory Officer — Temperature & Humidity Laboratory

Page 2

GSA/THL/2026/0001
D-K-15209-01-00
2026-06

##### Calibration Procedure

DKD-R 5-8:2019 (Humidity) / DKD R-5-1:2018 (Temperature)

Place of test: Humidity Laboratory

##### Relative Humidity Measurement Results

Setpoint | Ref Temp (°C) | Ref RH (%RH) | EUT RH (%RH) | Deviation (%RH) | Expanded Uncertainty U (%RH)
--- | --- | --- | --- | --- | ---
SP1 | 25.00 | 39.87 | 40.00 | 0.1350 | 1.702
SP2 | 25.00 | 59.87 | 60.88 | 1.0100 | 1.702
SP3 | 24.99 | 79.88 | 80.17 | 0.2950 | 1.703
15°C / 50%RH | 14.99 | 49.82 | 50.00 | 0.1850 | 1.708
35°C / 50%RH | 34.98 | 49.84 | 50.15 | 0.3150 | 1.699

##### Temperature Measurement Results (at ~50 %RH setpoints only)

Setpoint | Ref Temp (°C) | EUT Temp (°C) | Deviation (°C) | Expanded Uncertainty U (K)
--- | --- | --- | --- | ---
15°C / 50%RH | 14.99 | 15.03 | 0.0400 | 0.584
35°C / 50%RH | 34.98 | 35.02 | 0.0440 | 0.593

##### Uncertainty of Measurement

The uncertainty stated is the expanded uncertainty obtained by multiplying the standard uncertainty by the coverage factor k = 2. It has been determined in accordance with DKD-R 5-8:2019 and EA-4/02 M:2022. The value of the measurand lies within the assigned range with a probability of approximately 95%.

Uncertainty contributions include: reference standards, chamber spatial inhomogeneity, temporal instability, radiation influence, EUT resolution, repeatability, and self-heating effects.

##### Additional Information

The results of calibration are valid at the time of calibration.

This certificate complies with ISO/IEC 17025 requirements.

Issued by the GSA Temperature and Humidity Laboratory.

End of calibration certificate.

Ghana Standards Authority — Temperature & Humidity Laboratory • Cert. No. GSA/THL/2026/0001 • Issued: 2026-06-02