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Really cheap digital calipers

Discussion in 'Electronic Basics' started by William J. Beaty, Jul 16, 2003.

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  1. Those Chinese 6in digital calipers used to be $69 everywhere. They're
    the steel ones with 0.0005" display. Harbor freight tools had them
    for $39 for awhile... Good Lord! (choke!) I just noticed that Harbor
    Freight has them on sale for half price! They're still $60 over at
    Jameco. Damn. I already bought a cheap plastic version a few months
    back.

    $19.99 Cen-tech 6" digital caliper
    http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=47257

    If you really want cutting edge product with 0.0001" display and serial
    comm jack for PC interface, get an expensive one. The above device is
    exactly the same as the 'good calipers' that the people in the lab were
    always fighting over, back in 1992 when I was at Eaton Photocontrols

    PS

    If you want to experiment with night vision scopes, Harbor Freight
    has a cheap Russian one for $70

    $69.99 2.4X scope w/illuminator
    http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=45372

    PPS

    Sounds like I'm an ad copy writer for Harbor Freight. Maybe I should
    call them up and ask for kickbacks. :) Also, right now I'm
    looking for a cordless screwdriver. The decent ones are like $120.
    Harbor Freight has one for $16. Has anyone here bought one of these?
    I mean, are they total crap? They certainly won't be like Makita or
    anything. But are they worth even the $16?


    ((((((((((((((((((((((( ( ( (o) ) ) )))))))))))))))))))))))
    William J. Beaty Research Engineer
    UW Chem Dept, Bagley Hall RM74
    Box 351700, Seattle, WA 98195-1700
    ph206-543-6195 http//staff.washington.edu/wbeaty/
     
  2. I wonder how good these are, accuracy, precision, repeatability?
    Anyone running tests?
    I have an early Starrett LCD digital that cost big bucks several years ago
    and used mecury cells!
    These mercury cells are unobtainum today..
    I found a close cheap alkaline replacment at Walmart..
     
  3. The ones I had at a past job look identical to their photos. For
    0.001" electronics use I never saw any weirdness. Much better
    than the flexible plastic ones. The only thing I wondered about
    was how much they shrink in outdoor cold weather, but I never
    tried it.


    Maybe that's why they're $20. If they call out a mercury cell,
    the seller can't just cross out that part number and write in
    a replacement... but the buyer can.


    ((((((((((((((((((((((( ( ( (o) ) ) )))))))))))))))))))))))
    William J. Beaty Research Engineer
    UW Chem Dept, Bagley Hall RM74
    Box 351700, Seattle, WA 98195-1700
    ph206-543-6195 http//staff.washington.edu/wbeaty/
     
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