Since the DRunnner and TiHawk play pretty similar I was curious about the specs but I had a heck of a time finding specs on the TiHawk so I pulled out my certificate in case anyone else is interested.
just for clarification, for precise measurements you cannot use a caliper, you must use a micrometer, which being equipped with a clutch avoids the error due to the greater or lesser pressure that your hands exert on the instrument and guarantees, in addition to objective precision, repetitiveness in measurement.
Need for a certain accuracy level is dependent on what your goal is. In some cases (eg wood) a tape measure is correct. In other cases (eg measuring microns), micrometers are not accurate enough.
In this case, Mo was measuring with an accuracy of .04mm which is well within reason for what appears to be the goal here (show the size). Mo’s calipers have a clutch wheel as well.
There isn’t a one size (pun intended) fits all method.
I always add at least 2" to my measurements. Easy. Start at 2" mark from the base to make sure you rule out any standard deviation. But it’s the thic that counts. Who wants to be stabbed by a long pencil when you could be spread like the curtains on a triple double wide window. Calipers all show this data to be accurate. Calipers and calibers I bring tha .50 cal. That’s what she said. Double barrel loaded.
The wheel of a caliber (which is not a real clutch) does not have a spring calibrated at a constant force like the clutch of a micrometer … this is the characteristic that guarantees the repeatability of measurements.
however this evening I will carry out comparative measurements with both instruments on the ti-walker diameter so as to compare the results obtained.
P.S. Why should a micrometer not be suitable for obtaining measurements of the order of microns?