TetraLite Products
TetraProbe
A Low-cost Digitizing Probe for CNC Applications.
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The TetraProbe is called the TetraProbe because at TetraLite Products I try to start all my product names with the prefix "tetra".

The TetraProbe is not meant to compete with high-end digitizing probes with extremely fine accuracy in the micron range. However, you can expect repeatability within less than 0.0002" assuming your machine is capable of better resolution than that. Tests of the TetraProbe indicate that accuracy down to 0.00019" or less is possible. Some of my tests seem to indicate that repeatability errors of less than 0.0001" may be achievable on an accurate machine.