POWER OF ATTORNEY

The undersigned hereby constitutes and appoints each of Joseph H. Griffith,
Michael S. Turner and Michael Minahan, signing singly, and with full power
of substitution, the undersigned's true and lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned, in the undersigned's
capacity as officer and/or director of 908 Devices Inc., a Delaware
corporation (the "Company"), from time to time the following U.S. Securities
and Exchange Commission (the "SEC") forms: (i) Form ID, including any
attached documents (such as Update Passphrase Authentication), to effect the
assignment of codes to the undersigned to be used in the transmission of
information to the SEC using the EDGAR System; (ii) Form 3, Initial Statement
of Beneficial Ownership of Securities, including any attached documents;
(iii) Form 4, Statement of Changes in Beneficial Ownership of Securities,
including any attached documents; (iv) Form 5, Annual Statement of Beneficial
Ownership of Securities in accordance with Section 16(a) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and the rules
thereunder, including any attached documents; (v) Schedules 13D and 13G; and
(vi) amendments of each thereof, in accordance with the Exchange Act, and
the rules thereunder, including any attached documents;

(2) do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to complete and execute any such Form 3,
4 or 5, Schedule 13D or 13G, or any amendment(s) thereto and timely file such
form(s) with the SEC and any securities exchange, national association or
similar authority; and

(3) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit
to, in the best interest of, or legally required by, the undersigned, it
being understood that the documents executed by such attorney-in-fact on
behalf of the undersigned pursuant to this Power of Attorney shall be in such
form and shall contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact, acting singly,
full power and authority to do and perform any and every act and thing
whatsoever requisite, necessary or proper to be done in the exercise of any
of the rights and powers herein granted, as fully to all intents and purposes
as the undersigned might or could do if personally present, with full power
of substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted.  The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of
the undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 or Regulation 13D-G
of the Exchange Act. The undersigned hereby agrees to indemnify the
attorneys-in-fact and the Company from and against any demand, damage, loss,
cost or expense arising from any false or misleading information provided by
the undersigned to the attorneys-in-fact.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file such forms with respect to the
undersigned's holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.  This Power of Attorney
supersedes any prior power of attorney in connection with the undersigned's
capacity as an officer and/or director of the Company. This Power of
Attorney shall expire as to any individual attorney-in-fact if such
attorney-in-fact ceases to be an employee of the Company.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 4th day of May, 2022.

/s/ Michele Fournier
Signature

Michele Fournier
Print Name