# Certificate fields The certificate example is shown in [calibration-certificate](https://help.boomerang3.com/boomerang-3-calibration-app-manual/performing-the-calibration/finalise-calibration/calibration-certificate "mention"). The description of the contents of its fields is presented in the table below.

Field	Contents	Remarks
Certificate Number		Generated by app.
Calibration Date	Date of calibration	Set by app.
Issued by	Issuing company name Address	Entered into “Info” form.
Customer	Sensor user company name Address	Entered into “Info” form.
Customer's representative	Person representing the customer	Entered into “Info” form.
Customer's address	Address where the calibration takes place.	Entered into “Info” form.
Next calibration	Date of the next calibration.	Label “Next calibration”, shows the date of the next calibration calculated by adding the B3 “Calibration report interval” value to the current calibration date.
Calibration environment	Text “Onsite calibration” plus temperature and humidity.	Temperature and humidity entered into "Define sensor" form.
Calibration Method	Description of method.
Uncertainty of Measurement	Description of uncertainty.
Reference Instrument Type	Type and S/N of the reference instrument	Set by app basing on BT scan.
Reference sensor	S/N and certificate number of the reference sensor	Entered manually when a reference sensor is connected in the app.
Reference Sensor Adjustment	Reference sensor adjustment value.	Taken from reference sensor certificate. Filled-in automatically for WLREF. In case when two adjustments values are used as described in reference-readings-handling, only the first one used is presented in this field.
Object	B3 object name or filled-in object name for manual mode.	Set by app basing on data from B3 or entered into "Define sensor" form.
Measuring Point	Measuring point name	Set by app basing on data from B3 or entered into "Define sensor" form.
Sensor Type	Type of calibrated sensor.	Set by app basing on data from B3 or entered into "Define sensor" form.
Sensor Serial Number	Serial Number of calibrated sensor.	Set by app basing on data from B3 or entered into "Define sensor" form.
Sensor Resolution	Resolution of calibrated sensor.	Set by app basing on data from B3 or selected in "Define sensor" form.
“Temperature readings” table	Temperature readings	Temperature readings of reference and calibrated sensors taken at the same minute during 10 consecutive minutes, starting after delay set in "Define sensor"form. The reference readings shown in the table are adjusted as described in reference-readings-handling.
Average Reference Sensor Temperature (Tr) °C	Average of the reference sensor readings.	Calculated average of the reference sensor readings. 10 adjusted reference readings are summed up and divided by 10. The result is then rounded to 2 digits after the decimal point.
Average Calibrated Sensor Temperature (Tc) °C	Average of the calibrated sensor readings.	Calculated average of the calibrated sensor readings. 10 calibrated sensor readings are summed up and divided by 10. The result is then rounded to 2 digits after the decimal point.
Temperature adjustment (Tr-Tc) °C	Calculated adjustment value.	Average reference minus average calibrated sensor temperature.
Uncertainty	Uncertainty of measurement.	Calculated basing on the reference sensor parameters, calibrated sensor resolution and measurements variance.
Released on:	Date when the certificate was signed	Set by the app.
Released by:	Name and family name of the user signing the certificate	Set by the app basing on the B3 user signing the certificate or taken from "Info" form in case of manual calibration.