ProForm 66903 Valve Spring Height Micrometer

The ProForm 66903 Valve Spring Height Micrometer presents a mixed bag of experiences for its users. On one hand, many customers commend the tool for its impressive accuracy, with reports of measurements aligning closely with professional-grade equipment. One user highlighted that their micrometer maintained a precision of .0002 inches across its entire measuring range, making it especially suitable for standard applications, such as working with small block Chevy (SBC) heads. However, there are notable drawbacks. Some users expressed frustration regarding the tool's size, noting that it may be cumbersome for smaller valves or tighter spaces—leading to modifications that resulted in damage to the micrometer. Quality control has also come into question; a user noted discrepancies with the inscribed numbers being backward, detracting from usability. Furthermore, issues regarding the variability of inner step depths among different units add a layer of complexity, necessitating additional measurements that can complicate straightforward use. The lack of customer support from ProForm was another concern expressed, as users sought clarity on these inConsistencies but received no response. Overall, while the ProForm 66903 Valve Spring Height Micrometer can function effectively for certain applications, particularly for larger engine types, potential buyers should carefully Consider their specific needs and the challenges highlighted by other users. **