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This knob is the replacement for the timer and for the temperature control knobs used on Best Built ultrasonics. Best Built recommends that you use the on/off switch to turn your best built ultrasonic on and off and not the timer. Using the timer to turn your best built off will shorten the service life of your analog timer and can break the timer knob.
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We currently ship within the US, with more countries coming soon.
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🇺🇸 Ship from USA · On Agora since 2025
$14.00