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Alex Orange
Comentado en los Estados Unidos el 21 de junio de 2024
Loose where it shouldn't be, tight and binding where it shouldn't be. Overall this is a great case of "you get what you pay for". I won't be buying "Zerone" garbage ever again, pay attention to the fact that they basically hide their brand name, sure sign something's wrong.
Victor Madguz
Comentado en México el 11 de julio de 2023
Muy buen producto es lo que se esperabaparece de buen material
Henry Guerrero
Comentado en los Estados Unidos el 12 de enero de 2022
Will be using this on my metal lathe for inside measurements.
A_rky101
Comentado en los Estados Unidos el 9 de septiembre de 2022
This one costed me about $30 after tax, approx 1/8 the price of the same spec from Mitutoyo. The measuring jaws are part of the stainless steel of the body except for the measuring side of the jaws having hardened material or carbide. But the surface is kind of rough and not perfect half circled curve. For Mitutoyo one, these measuring jaws are entirely carbide little cylinder rods so that can be used as measuring surface and less prone to error when holding in different direction or angles against the measured object.The sleeve and thimble look smooth and good. The scales are neatly marked. But the ratchet stop is not smooth at all.The accompanied calibration ring seems accurate when I measured it with Mitutoyo caliper. In measuring objects, make sure apply the same turns on ratchet stop as during measuring the calibration ring.Overall opinion: it’s cheap, low quality but could still be usable if proper calibration is made and right operation is established — know how to hold the micrometer so that the measuring jaws have proper and constant contact to the measuring object surface, right pressure used when turning the thimble and the ratchet stop. Or after lock the clamp in each measuring, use a good caliper to verify the distance between the two jaws of the micrometer. This usually could avoid dramatic errors in using the micrometer alone.You may use this cheap piece as a learning tool to know an inside micrometer before you decide investing in serious one such as those produced by Mitutoyo or Starrett. To achieve a precision metrology, quality tools from those brand names always turn out to be the most economic spending.
Dirk Brewer
Comentado en los Estados Unidos el 28 de noviembre de 2020
Definitely not what is pictured or described. Plastic case, markings on instrument don't match the images.Build quality is subpar. When I got it, it was very stiff. Just using the ratchet it wouldn't rotate without engaging the ratcheting mechanism. Couldn't even tell if it was calibrated to the supplied 5 mm ring.Decided to go all out and disassemble and try to get it functional. Found the moving pin/jaw alignment blade was to tight, the slotted screw for adjusting was damaged at the factory. Removing the differential barrel was EXTREMELY difficult, they really jammed it on at the factory. The fixed barrel set screw slot is also damaged. The differential screw collar was jammed on to tight. The differential screw had debris in all it's threads.After full disassembly and cleaning and reassembly I was able to get everything to move smoothly. But the moving jaw wiggles because if I tighten the alignment blade to take out the wiggle then it doesn't turn smoothly.Checking the pin grind, they are not parallel (have a taper to them).Testing the accuracy after, the best that I can achieve is that it is ALWAYS 0.04 to 0.05 mm over (trying to account for the pin taper).Not worth sending back. Will use them in conjunction with a good micrometer. Open them up in a bore, tighten the locking screw (which is also to loose), then measure the pins with an outside micrometer.
Guy
Comentado en los Estados Unidos el 10 de enero de 2020
Super cheap. If they had spent a little more time on the fit and finish it might be a better tool. It will work for my current use. But you definitely get what you pay for with this one.
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