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Rather than setting calipers to a different diameter for each cut, Galbert calipers allow you to read the diameter in real time while you’re turning. The spring-loaded mechanism pushes against the work piece and moves an indicator on a large, easy-to-read scale.

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If you ever need work done on your brakes, it’s best to avoid brake shops for a variety of reasons — not the least of which is that they’ll often use a Jesus wrench (the biggest Channel Locks in their box) to compress the pistons, a procedure capable of cracking cheap calipers, and almost guaranteed to mar the piston. The right way is a brake caliper compressor, a sort of high-powered caulk gun designed to slip into the pad recess. Lisle’s model 25750 is a perfect example, and pretty inexpensive at just over $32 before shipping from Amazon.

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Starrett designed the almost 4″ jaws and 3mm diameter tips of their new 5006BZ-14/350 electronic groove calipers to measure the width of internal and external grooves. The caliper will measure outside grooves from 0″ to 12.5″ and inside grooves from 1.654″ to 15″.

They manufacture the calipers from hardened stainless steel and the tips can be installed facing in or out or to measure either outside or inside grooves respectively. The calipers read with a resolution of .0005 of an inch or 0.01mm.

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Generally speaking, a machinist’s measuring tools receive the same level of protection and reverence as the Holy Grail. Every reader’s probably had his ears filled with endless tales of how the mechanisms of calipers and micrometers must be regularly oiled, protected from dust, and kept away from moisture. Not this set.

Mitutoyo’s model 500-752 is marketed as coolant-resistant, which is really something, considering that automotive coolant is a powerful oxidizer that quickly rusts any iron it touches. Not exactly stuff you want around your $150 (from Production Tool Supply) measuring instruments. Other features include inch/millimeter reading with 0.0005in/0.01mm resolution, auto-shutdown, and shatter-resistant (IP67 compatible) display. The waterproofing also makes the calipers dust-proof, and with a claimed three-year battery life, they’re not likely to suddenly crap out due to wear, abuse, or battery death.

A retailer called Reliable Paper is selling the set for $12 less than PTS, but they’re unrated according to Google’s product search.

500-752 [Mitutoyo]
Mitutoyo 500-752 [Production Tool Supply]
Street Pricing [Google Products]

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