No real servo does continuous rotation. Many unscrupulous distributors do not differentiate between the two types and you cannot tell from the model number which type it is
Servos for use in model aircraft and helicopters are always proper servos
Look at this one
It is a servo, but if you just buy one online it could be either type, so read what the web page says very carefully and check with the seller if necessary
Did you understand my warning about powering a servo from the Arduino ?
For instance, on the page that I linked to look at the stall current
Current draw at idle 10MA
No load operating current draw 170MA
Stall current draw 1200MA