Silverline External Micrometer 25mm (282378)

SUMMARY A great budget micrometer that suited my needs fine. I usually use a set of digital calipers for most of my measurements involved in handloading ammunition for target shooting, however, in one instance I needed something which had more precision than the set of calipers I had. Hence the purchase of this micrometer. It performed great and would recommend to anyone looking for a good budget micrometer. WHATS IN THE BOX - Cardboard sleeve - Plastic box - Micrometer - Double sided tool for zero-ing - (No instructions, so best to read up on Wikipedia if you're unsure how to use them) REVIEW The micrometer has all the typical features that you would expect on any old micrometer; easy to read scale, knurled thimble, ratchet for error free measurement* and lock nut. *Well, at least takes the human element out of it by applying the same compression on a surface TEST RESULTS I needed a device that would measure the external diameter of the neck of a loaded bullet, and from this dimension I can then work out how much I need to size my brass casing (to maintain neck tension) so it was critical that I have an accurate, precise measurement. Using some high quality brass cases (Lapua) I had loaded up 10 rounds also using high quality Lapua bullets. These high quality components have very repeatable measurements and should therefore provide a good test for the micrometer. Results as follows: 7.37mm, 7.39mm, 7.37mm, 7.38mm, 7.38mm, 7.38mm, 7.37mm, 7.37mm, 7.37mm, 7.38mm Range: 7.37mm - 7.39mm = 0.02mm (0.2902"-0.2909"=0.0007") For me, the accuracy was only required to three decimal places in inches (i.e. 0.290) but I am more than impressed with the results. I re-measured another 10 loaded rounds and found that a measurement of 7.39mm appeared only once so I'd be happy to say that this is more down to the brass thickness for that particular case, and not the tolerance of the micrometer. The reason for this measurement was that I didn't known which part I should order to re-size the brass to give neck tension; 0.288" or 0.289", which is the reason I wanted something so accurate for measurement. This device provided that level of accuracy needed and I am most pleased with it. I have received the re-sizing part, 0.288", and once I've fired those bullets and re-size them I will re-measure some cases as they should all have an outside neck diameter of precisely 0.288". Will update this review accordingly!

I still refuse to believe that this thing cost only a couple of pounds delivered. Has to be the measurement tool bargain of the century! QUALITY: According to the other reviews the quality may vary, but I must have been lucky and got a good sample. Overall finish is perfect, spindle has no wobble, thimble turns very lightly and smoothly (as long as the spindle lock is fully released... I'm still learning!), and rachet stop works perfectly. Free tip: Check wikipedia for great explanation of micrometer parts. ACCURACY: I needed this micrometer for a valve clearance job on my car, to measure the exact thicknesses of valve shims. The measurement range will be small, 4.25mm is the thickest shim available. I tested the accuracy by measuring thicknesses of single feeler gauge blades, or combinations of blades. All single blade (0.05mm to 1.00mm) measurements were accurate, micrometer showing +0.002mm to +0.003mm per blade, which I find a very good result for a micrometer costing well under 10 pounds. When measuring thicknesses of several blades together, the rachet stopped a bit too early, giving too high a reading. I presume this is more of an issue with me measuring several blades together rather than with the micrometer. This cannot really be avoided as the blades would need to sit completely flush with each other for the measurement to be accurate. When tightened a bit further with the thimble until tightness was about right (no gaps between blades and started feeling a bit more resistance), the reading was again off by just a couple of thousandths of mm. All in all, knowing that the micrometer reading is a tiny fraction too high but tne amount is constant, I can adjust my readings to get the exact thicknesses of shims down to just 0.001mm to 0.002mm - in other words, this super cheap micrometer will do its job nicely! ACCESSORIES: The micrometer came inside a plastic box. It will protect it from elements, but it only has some very thin padding inside. It could have had a bit more padding to stop the micrometer from moving. Also included was a calibration tool. There was no manual included. A small A4 size manual with descriptions of micrometer parts and how to use it, calibrate it and take care of it would have been nice. Luckily, there's internet. PRICE AND DELIVERY: What can I say. Seven quid with free next day delivery with Amazon Prime.

It’s a micrometer for less than £15. Those expecting the quality of a brand like mitutoyo are frankly being delusional and unreasonable considering the price difference. This is a solid little measuring device that is fine for the DIYer, offering enough accuracy for measuring disc thickness etc.

Uso questo strumento oramai da parecchio tempo. Costruito molto bene, si presenta robusto e di facile lettura. Sicuramente deve essere usato con le accortezze del caso, riponendolo sempre al riparo da umido ed agenti atmosferici, e tenendolo pulito e lubrificato. Ad oggi estremamente valido e funzionale. Acquisto consigliato.

la precisión es buena por ahora, lo único que si aprietas mas una vez q otra t puede poner una diferencia de 0.01 por lo que se puede cuadrar perfectamente

J'ai mis 5 étoiles non pas pour la qualité absolue de cet outil, mais pour son rapport qualité prix. Je l'ai acheté pour mesurer l’usure des disques de feins sur mes voitures et éviter les échanges beaucoup trop fréquents si on écoute les "spécialistes". Il est livré en coffret pastique résistant moussé à l'intérieur. La glisse du tambour est parfaite, l'aspect visuel est très correct la précision est à 1.5 centièmes de millimètres. Le zéro est apparemment réglable au moyen d'une clé (fournie), je n'ai pas encore essayé. L’équivalent de cet outil en grande maque d'outillages vaut environ 12 fois plus cher mais n'est évidemment pas 12 fois meilleure. Comme la différence de prix se justifie quelque part, le mieux est de lubrifier cet outil à l'huile d'armes et au chiffon pour le garder longtemps sans oxydation, il en vaut la peine. Pour des travaux de mesure à plus de 3 centièmes, je recommande sans hésiter.

Die Messschraube kam sauber verpackt bei mir an. Eine Kalibrierung war nicht notwendig, auch befanden sich keine Fettrückstände oder ähnliches auf den Oberflächen. Für meine Zwecke (hin und wieder die Dicke der Bremsscheiben am Motorrad/Fahrrad vermessen) reicht das Gerät völlig aus.

Works well, and has a ratchet stop mechanism which I wasn’t expecting.