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Optical Comparator $20.00

Uxbridge, ON
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Nice price, but one of those items that would be great to have while taking up valuable space that could be used for something else that would be used more than once a year.
 
ChazzC said:
Nice price, but one of those items that would be great to have while taking up valuable space that could be used for something else that would be used more than once a year.
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That could be why it's $20. Seller seems like a legit human, maybe he's tired of bumping in to it.
 
My $47 clip on iPhone magnifier. Even has integrated LED ring flash. (0.5mm pencil lead for scale). Trouble is, no background grid like @gerritv has.
ps - can I send you an RC glow plug for you to settle a bet regarding threads? Well... its not a bet until I know the answer first, THEN I'll place the bet haha

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One of the fun things about this forum is I keep on getting new things to try out. My $2 mechanical pencil, with 0.5mm lead. Using my iPad 8mp camera and a clip-on macro lens. Background is a vernier caliper with 0.025” graduations. Confirmed lead diameter at 0.020” using the calipers.

So a little thinking outside the box gets a scale as a backdrop.

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gerritv said:
Once you have one, you will change your mind.. More useful than you might think at first.
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This. The value isn't so much in just magnification, it's in measurement ..... the stage has motion in two planes so with indicators on the axes you can precisely measure all sorts of things. Position the crosshairs, note the indicator reading, move the stage etc
 
Or draw a part 10x its size onto tracing paper (can laser print it as well) and use that as an overlay to match the part you are trying to create. My Nippon Kogaku (Nikon) 6 has 10, 20, 50 and 100x lenses, any three of them in a turret at one time.

And yes, having a scale in the view on a USB camera or phone works in a pinch but it is not the same. Notice how the engraving marks also get magnified, leading to guessing errors at high magnifications. But you do need space for the device so there is that to consider.
 
ps - can I send you an RC glow plug for you to settle a bet regarding threads? Well... its not a bet until I know the answer first, THEN I'll place the bet haha
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Sure but I think Dabbler should have his working by now and is closer by.
 
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