How often does the RetroSign need to be serviced?
RetroSign is a very robust instrument which can stand daily use without need for service. If you should have an accident with the instruments (being dropped, being hit hard and alike) DELTA recommends servicing the instrument. If you want to be sure the instruments work correctly at all times you may consider an instrument service at DELTA at regular intervals. If the instrument is used every day DELTA recommend these intervals being once a year, if used less often a service every 2-3 years will do.
