Product: Zero-Set Test Indicator Holder
Brand: LLDSIMEX
The design of this device is based on the "Zero-It"holder.  The holder can be used with any Test Indicator that has dovetails, or those that have a.250" diameter top stud.  The holder block could be easily modified for use with indicators such as the Starrett "LastWord" type, or dovetail adapters can be purchased for theseindicators. Construction is not too difficult.  There are only a couple ofareas where special attention is required.  These are the holesused for the rods for the course and fine adjust.  This is because even a small amount of misalignment can cause binding in themechanism.  The instructions detail the use of a dial indicatorfor locating the holes to be drilled.  If you have a digitalreadout, the dial indicator should not be necessary. All holes should first be started with a center drill, this helps insurethat the hole will be started straight and in the correctlocation. The Zero-Set fits all dovetail equipped indicators, and is used to check the alignment of the centers of round material in relation to the cutting head.    Speeds up set-up operations tremendously! Manufactured with 1/4", 3/8", and 1/2" spindle post and has an effective measuring range of 3/8" to 8".    Quick adjustments and line adjustment controls. 
Used to check the alignment of round material on a Milling Machine
Equipped with a spindle post with 1/4",3/8" and 1/2" dia.
fits all dovetail equipped indicators
It reaches anywhere within a 8" diameter and fine-adjusts about 3/8" with knob

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