TESTO 557s Analog and digital readings stuck on 10 psi- 24 psi new out of the box. How to calibrate
How to calibrate your pressure on your new Testo 557S If you open up your box and turn on your brand new set of Testo 557S gauges and find that your analog and digital displays are Are stuck and will not move off of some pressure other than zero they are not broken they just need to be calibrated using the button to atmospheric pressure.
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