Seaward 350 PrimeTest - Manual (Page 42)

PrimeTest 350 Operating Instructions
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9.7 Verify Calibration
After 12 months have elapsed since the last verification
or calibration, the PrimeTest 350 real-time clock will
remind users that verification is required. Contact an
approved Service Agent to arrange verification.
Note: Verify Calibration is password protected and
can only be accessed by an approved Service
Agent.