If you own a captive bolt stunner, you have a legal and ethical obligation to ensure it performs correctly. One of the most important aspects of this is annual velocity calibration.
Velocity calibration measures the speed and performance of the bolt when fired. The impact force must be sufficient to render livestock instantly unconscious. Too little force risks incomplete stunning. Too much can stress internal components.
Testing involves controlled measurement of bolt speed and performance output. If results fall below standard, worn parts are replaced and the unit is re-tested. Only once performance is verified is a calibration certificate issued.
Why does this matter?
Because welfare regulations require equipment to be maintained in effective working order. During veterinary audits, Red Tractor inspections or official welfare checks, documentation may be requested to confirm compliance.
A valid calibration certificate demonstrates:
- The stunner has been professionally tested
- Bolt velocity meets required standards
- The device is fit for humane dispatch
- The operator is acting responsibly
Glynn Hatcher provides this service from his Cornwall workshop, supporting clients nationwide. Devices can be sent securely (without cartridges) for servicing, testing and certification. Hire units may also be available during service periods to prevent operational gaps.
Many livestock keepers underestimate how quickly performance can degrade. A year of regular use is enough to impact internal mechanics. Calibration is not about suspicion — it is about verification.
Humane dispatch depends on certainty. Velocity calibration provides that certainty.
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