Replace the battery with a premium lithium or alkaline cell. Clean the battery contacts with a cotton swab dipped in isopropyl alcohol. Symptom: Erratic or Drifting Readings
the balanced 50% duty cycle on your monitoring device. protek b801 manual link
Without the manual, users often misdiagnose these issues: Replace the battery with a premium lithium or alkaline cell
The primary specifications and features are summarized in the Protek B801/B803 Datasheet via Mouser Electronics . protek b801 manual link
Use the main tuning dial to adjust the frequency within the chosen range. The 4-digit display will show the output frequency.
Open the battery compartment using a standard Phillips #1 screwdriver.