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      <secFileNumber>000-11740</secFileNumber>
      <issuerAddress>
        <com:street1>12100 W 6TH AVE</com:street1>
        <com:city>LAKEWOOD</com:city>
        <com:stateOrCountry>CO</com:stateOrCountry>
        <com:zipCode>80228</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>3039878000</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Schmieder John Bradley</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
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    <securitiesInformation>
      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>THE CHARLES SCHWAB CORPORATION</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>7000</noOfUnitsSold>
      <aggregateMarketValue>859039.00</aggregateMarketValue>
      <noOfUnitsOutstanding>5384291</noOfUnitsOutstanding>
      <approxSaleDate>09/13/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
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      <securitiesClassTitle>COMMON</securitiesClassTitle>
      <acquiredDate>12/10/2021</acquiredDate>
      <natureOfAcquisitionTransaction>INHERITANCE</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>FROM FATHER</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>7000</amountOfSecuritiesAcquired>
      <paymentDate>12/10/2021</paymentDate>
      <natureOfPayment>NA</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <remarks>FULL ACCOUNT TITLE: J SCHMIEDER &amp; L BURTON TTEE JOHN B SCHMIEDER IRRV TR</remarks>
    <noticeSignature>
      <noticeDate>09/13/2023</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>06/14/2023</planAdoptionDate>
      </planAdoptionDates>
      <signature>JOHN B SCHMIEDER</signature>
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144
0001637852
XXXXXXXX
LIVE
0000724004
MESA LABORATORIES INC /CO/
000-11740
12100 W 6TH AVE
LAKEWOOD
CO
80228
3039878000
Schmieder John Bradley
Director
COMMON
THE CHARLES SCHWAB CORPORATION
3000 Schwab Way
Westlake
TX
76262
7000
859039.00
5384291
09/13/2023
NASDAQ
COMMON
12/10/2021
INHERITANCE
FROM FATHER
N
7000
12/10/2021
NA
Y
FULL ACCOUNT TITLE: J SCHMIEDER & L BURTON TTEE JOHN B SCHMIEDER IRRV TR
09/13/2023
06/14/2023
JOHN B SCHMIEDER