Has not been calibrated since jul 2013

Proto J6232 For over 160 years, the Stanley Proto brand has been synonymous with quality, reliable products. Their tools are made in America because they believe making the highest quality tools comes first. Proto tools are heat forged and nickel-plated. Having sheer tool strength, they won't snap, bend or bust when called to duty. They are tested to thousands of cycles. And they are proven - having done the job you're asking of them for decades, literally.