Testo 550?

[shawnml9]

Was using 550's today reading SH/SC just fine all of sudden lose SH thought it may be batteries replaced them then lost SC/and SH.. all the arrows are doing now are making screen blink...Anyone else come across this?

[HVAC-Doz]

Hello

You may want to go to the Testo site for support to see if you need to download firmware or to reset it

http://www.testo.com/online/abaxx-?$part=PORTAL.USA.SimpleContentDesk&$event=show-from-menu&categoryid=49804543