Toll-Free: 877-761-0322 Monday through Friday from 8am to 4pm MST
MSRP: $5.99
Old Will's Price: $3.50

    My Weigh OIML Class M2
    100 Gram Calibration Weight

    Accuracy: +/- 16 mg

    My Weigh OIML Class M2 Calibration Weight
    "In A Nutshell"
    MaterialChrome plated steel
    ClassOIML M2
    Tolerance+/- 16 mg (0.016 g)

    Product Details

    This OIML Class M2 100 gram calibration weight has an accuracy of +/- 16 milligrams (0.016 grams). Use this calibration weight alone, or combine it with more weights to accurately calibrate your digital weighing scale.

    Product Reviews

    Overall Customer Rating:
    from 22 customer reviews.
    Awesome service
    This Product was delivered quickly, but the shipping envelope tore in shipping, and the product was lost. I contacted Customer service, and they re-shipped the product and it was here in just a couple days. I would recommend this company to anyone. The product itself was exactly as advertised, and was less expensive than lower quality ones elsewhere. I am very happy.
    Reviewed by: Mark Boyle from Janesville, WI on 1/12/2016
    Perfect weight
    Exactly as described! Fast shipping , everything was perfect!
    Reviewed by: Steven from WV on 12/28/2015
    Product is better then described and shown. I ordered 2 M2 Calibration Weights @100g. Both were very precise and accurate.
    Reviewed by: David from Wheeling, IL on 11/9/2015
    Fast Shipping
    Had my order in my mailbox the same day I received a shipping notification! Worked great to calibrate my digital scale
    Reviewed by: Michelle from New Orleans, LA on 6/25/2015
    Shipped fast and was as described. Worked perfect to cal my scales.
    Reviewed by: Daren from Oregon on 2/8/2015
    Arrived with bottom plate off and weight fallen out
    The 100g weight has a small circular plate on the bottom and inside is a ball-bearing which adds about a gram. When the order arrived, the plate was off, and the bearing was floating around inside the plastic bag. Not a big deal as I just used a dab of superglue to re-attach it. Also, not a big deal because OldWillKnott gave it to me for free (I asked about calibrating my scale and they recommended a 500 and 100 weight which I ordered, but turns out I had an older model which only needed the 500. Thus they kindly just credited me the amount for the 100g saving me the trouble to ship it back.) 4 stars for a combination of great service and an easy to resolve problem despite the quality issue.
    Reviewed by: Vel Natarajan from Chicagoland on 1/28/2015
    100 gram weight
    This weight works great fantastic company to buy from
    Reviewed by: josef deeble from vermont on 12/1/2014
    M2 Calibration Weight - 100 gram
    Service was grate and product was shipped fast. I got my order the next day. Very happy with the product and I would order from here in the future.
    Reviewed by: Richard M. Brown from Springfield, MO. on 6/6/2014
    M2 100 Gram Weight
    I purchased this with my scale in order to check it for accuracy periodically. I also purchased the 200 gram calibration weight, in case I need to re-calibrate. Glad I purchased both with my scale, it is nice to have them if needed, and to test the scale periodically.
    Reviewed by: trans from Michigan on 3/11/2014
    As described
    Wanted to know how accurate a new digital scale was that is supposed to have a +/-1 gram tolerance. Ordered this test weight and it comes up as 99 grams so either the test weight is off by 1 gram or my scale is but either way it is within tolerance.
    Reviewed by: Adam W from Houston, TX on 11/5/2013
    all around perfect
    Excellent product, very low price, and fast delivery. Couldn't ask for more!
    Reviewed by: Jay from washington, dc on 9/17/2013
    Fast Shipping and Perfect Condition!
    Reviewed by: Jamie from 219 West 4th Street apt.4 on 8/19/2013
    Cal.wt and Scales
    I purchased the JS-300V pocket scales first, and use it at least twice everyday to measure coffee,I also use it for other projects,it is very accurate and easy to use,I liked it so much I bought a second one which is the model JSR300 for backup or maybe a gift.I got the 100g cal wt. this order and checked both scales,no problem.Thanks for the great scales and super fast great service.
    Reviewed by: obNwv from West Virginia on 8/12/2013
    Pocket scale and calibration weight
    This company is by far the most customer service oriented I've dealt with on the web. The products are excellent and the prices are right. Shipping could not be better. I will do business again with this company and I highly recommend them to everyone.
    Reviewed by: Zach from Virginia on 6/3/2013
    Excellent Product -- Amazing Service
    The 100g calibration weight is exactly what I wanted and the service was more than I expected. I placed my order on a Tuesday and the package arrived on Friday. Unfortunately, the package had been shredded during shipping. I called the help line and, at no charge, they sent me another. I can certainly recommend doing business with Old Will Knot
    Reviewed by: Daniel Williams from Enumclaw WA on 1/27/2013
    100 gram weight
    I ordered the 100 gram weight when I bought my jewelry scale. Both products were delivered super fast even during the holiday season. Using this weight I can easily prove to myself an scale is measuring correctly.
    Reviewed by: JCD from NH on 1/12/2013
    Excellant Service
    Website Very Friendly, Great Price, Fast Shipping.....Very Happy.... Will Be Back...... Thank You.....
    Reviewed by: John from New Jersey on 12/17/2012
    Spot On
    This is exactly as expected. No surprises here...
    Reviewed by: shawn from Los Angeles on 11/2/2012
    M2 Calibration Weight - 100 gram
    I bought this scale for my husband. He loves it. Easy to use and accurate. Shipping was so fast, and the customer service is excellent.
    Reviewed by: Elaine Cooper from Portland OR on 6/28/2012
    Excellent product and almost instant delivery!
    I was amazed how fast my scale and calibration weight arrived! The scale is very high quality and very simple to use. . . . .5 Stars all the way!
    Reviewed by: Mason Colbert from Cary, NC on 4/1/2012
    100 gram weight
    Great product and quick shipping
    Reviewed by: Greg from Parma OH on 12/27/2011
    All was as it should be. and was here in No time thx
    Reviewed by: Bruce Crafts from Davison Michigan on 12/5/2011

    Product Questions

    Number of questions: 0

    We know you have a choice when you buy scales online. Just know that when you buy digital scales from Old Will, it's always a "Worry Free Deal".