Opsens Inc. — Regulatory Filings 2021

Feb 19, 2021

70 Dalhousie Street Telephone : 418 529 6531 Suite 300 Fax ; 418 523 5391 Quebec City (Quebec) G1K 4B2 CANADA www.steinmonast.ca

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VIA SEDAR

Québec City, February 19, 2021

TO : Autorité des marchés financiers (as principal regulator)

Nova Scotia Securities Commission Office of the Superintendent of Securities, Prince Edward Island Financial and Consumer Services Commission, New Brunswick Office of the Superintendent of Securities, Service Newfoundland and Labrador Ontario Securities Commission The Manitoba Securities Commission Financial and Consumer Affairs Authority of Saskatchewan Alberta Securities Commission British Columbia Securities Commission

Re: OpSens Inc. (the “ Issuer ”)

Dear Sir/Madam:

We refer to the Short Form Prospectus of the Issuer (the “ Prospectus ”) dated February 19, 2021 relating to the distribution of 13,888,889 common shares of the Corporation (the “ Common Shares ”) for aggregate gross proceeds of $25,000,000 at a price of $1.80 per Common Share.

We hereby consent to the use of our firm’s name on the second page of the Prospectus and under the heading “Legal Matters and Interests of Experts”. We also consent to the use of our firm’s name and to the reference to our opinions under the headings “Eligibility for Investment” and “Certain Canadian Federal Income Tax Considerations”.

We confirm that we have read the Prospectus and we have no reason to believe that there are any misrepresentations in the information contained in the Prospectus that are derived from our opinions in the Prospectus or that are within our knowledge as a result of the services we performed in connection with the preparation of such opinions.

Yours very truly,

(s) Stein Monast L.L.P.

STEIN MONAST L.L.P.

MEMBER OF RISK MANAGEMENT COUNSEL OF CANADA (RMC/AGR)