Reply to "Allowable difference in steel tape measurements"

If the pros ("Surveying" noted by Pete above) recommend 1/5000, why would we recommend something for more demanding than that? 2.4-inches difference between 2 measurements of 1000-feet each seems like a very easy tolerance to meet. 1/8-inch seems nearly impossible, especially for a new measurer or for a measurement by a single measurer. Also, what does it mean (as Mike notes) to have a tolerance smaller than the accuracy of the measuring instrument?

I've measured my share of calibration courses and would probably remeasure if I had a difference over 1-inch for a 1000-foot course, unless there was an appreciable temperature change between measurements. This is based only in my experience almost all the calibration courses I've measured have a difference between measurements of less than 1/2-inch.

12/4/124:10 AM

<ul id="{%=id%}ButtonGroup" class="button-group h-popup-buttons even-button-group even-1">
    <li id="{%=id%}Okay_buttonContainer"><a id="{%=id%}Okay" href="javascript:void(0);" class="button success no-margin-bottom h-alert-modal-ok-button" role="button">OK</a><script type="text/javascript">
        (function() {
            function {%=id%}Okay_click(event, data) {
            {%=id%}Popup.hide();
        }
        
                $('#{%=id%}Okay').on('click', {%=id%}Okay_click);
        })();
    </script></li></ul><a href="javascript:void(0);" class="close-reveal-modal" aria-label="Close Modal">&#215;</a><div class="last-modal-focus focus-utility-element" tabindex="0"></div>
</div>
<script type="text/javascript">
        (function() {
            {%=id%}Popup = new SS.Popup.ModalPopup('{%=id%}');
        })();
    </script>

Skip to main content

Membership Required

Remove From Your Block List

Manage Follow Preferences

Block

Please wait...