12 unchanged sentences
however, no shares have been purchased under the plan in the last three fiscal years.
−Removed: This plan will continue until the maximum is reached or the plan is terminated by further action of the Board of Directors.
−Removed: We have made no repurchases of our common stock in the current or any of the last three fiscal years.
+Added: This plan will continue until the maximum is reached or the plan is terminated by further action of the Board of Directors. 
Description of Exhibit
4 unchanged sentences
XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
−Removed: Inline XBRL Taxonomy Extension Schema Document.
+Added: Inline XBRL Taxonomy Extension Schema Docment.
Inline XBRL Taxonomy Extension Calculation Linkbase Document
7 unchanged sentences
MESA LABORATORIES, INC.
−Removed: November 5, 2020
+Added: DATED: February 3, 2021
Chief Executive Officer
−Removed: DATED:  
−Removed: November 5, 2020
+Added: DATED:  February 3, 2021
Chief Financial Officer
−Removed:                         
+Added:                        
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.