TengyesDirect via Amazon offers the Tengyes 6" Stainless Steel Electronic Vernier Caliper for $31.76. Coupon code "TERH3AXB" cuts it to $22.23. With free shipping, that's $10 off and the lowest price we could find. It can measure inside and outside diameters, as well as depth and stairstep measurements in inches, millimeters, or fractions. Deal ends June 30.