BAR HARBOR – Business owners were alerted Wednesday to watch out for counterfeit $100 bills after a restaurant got stuck with one of the fake notes.

A spokeswoman for First National Bank of Bar Harbor confirmed Wednesday that the bank had received two counterfeit $100 in the past two weeks, but said that was not unusual in Bar Harbor in the summer, where millions of people come and go on vacation and one-day visits.

The problem did not seem broader than Bar Harbor; police and chamber of commerce officials in Portland, Bangor and Ellsworth said they had not heard of any problem with counterfeit cash.

Clare Bingham, Bar Harbor Chamber of Commerce director, said special pens called “counterfeit detector pens” are available to shopkeepers and other businesses to easily determine whether a bill is fake.