231, 231M Micrometers with Insulated Frames 0-1"/0-25MM This is a slightly heavier micrometer with thermal insulators mounted on the frame front and rear.This spindle and anvil are sized at .250" (6.35mm). Readability Fea tures • Starrett satin chrome finish – no glare – resists rust • Advanced sleeve design with staggered lines and distinct figures for precise and easy readability • Quick-reading figures – every thousandth numbered on inch tools Ease-of-Handling Fea tures • Balanced frame and thimble design ensure easy handling and better readability • Ring-type knurled lock nut for quick and sure locking • A combination ratchet and speeder for uniform pressure and quicker adjustment on all sizes • Gracefully designed tapered frame for use in narrow slots and tight places Accuracy and Long-Life Fea tures • Rigid one-piece frame of drop forged steel • Extremelyhardandstableone-piecespindle(theheartofouraccuracy) • Quick and easy adjustment Micrometers 221 Hi-Precision Micrometer 0-1" • Permits direct readings in ten-thousandths of an inch (.0001") without a vernier, plus automatic control of spindle pressure • Black graduated inner thimble and sleeve reading in thousandths and red graduated outer thimble and sleeve with large, widely spaced graduations which give direct readings in ten-thousandths Readability Fea tures • Exclusive constant pressure mechanism eliminates "feel" and ensures constant spindle pressure for all readings • Starrett satin chrome finish – no glare – resists rust • Advanced sleeve design with staggered lines and distinct figures for precise and easy readability • Convenient decimal equivalents on inch tools Ease-of-Handling Fea tures • Balancedframeandthimbledesignforeasyhandlingandbetterreadability • Ring-type knurled lock nut for quick and sure locking • Gracefully designed tapered frame for use in narrow slots and tight places Accuracy and Long-Life Fea tures • Rigid one-piece frame of drop forged steel • Extremelyhardandstableone-piecespindle(theheartofouraccuracy) • Quick and easy adjustment 231 and 231M Micrometers (0-1" Range) Cat. No. EDP Range Graduation T231XRL 63967 0-1" .0001" V231MXRL 63969 0-25mm 0.001mm Deluxe Padded Case for 231 and 231M Micrometers Cat. No. EDP Description 942 55961 Case for 1" (25mm) Micrometers 221 Hi-Precision Micrometer (0-1" Range) Cat. No. EDP Graduation T221XL 50754 .0001" Deluxe Padded Case for 221 Hi-Precision Micrometer Cat. No. EDP Description 910 55397 Case for 1" (25mm) Micrometers V231MXRL T221XL 32 M icrometers