4 Armed Calipers

New Variant:

Golden Ratio Calipers

These calipers work by having an extra arm that bisects the smaller of the two ratios. A couple of people asked me for these… so after a whole ton of experimenting with different shapes, I settled on these.

Golden Mean Calipers width=

Fibonacci Calipers

Golden Ratio Gauge

Golden Ratio Calipers

There are a number of different options for the cases… available from the shop.

8 thoughts on “4 Armed Calipers

  1. hi nick ,whats the cost of the new 4 armed calipers ,,up in orewa,,cheers

  2. Hiya – the 4-armed calipers are now in the shop, here:


  3. Hi , how I can order a big quantity of this?

  4. Hiya – if you contact me via the email at the bottom of the page, I can send you a quote, with photos of the various options.

  5. Hello!
    I can buy a phi caliper with you? i am from Mexico City

    1. Hiya – yes, that’s fine. I think you’ve already contacted me via email… will give a more in-depth reply to that.

  6. Nick did you ever figure out how people use these four-armed calipers with the 0.618 bisection?

  7. Hiya – yea, they’re used for doing micro-blading… the 4th arm marks the mid-point between the eyebrows.

    Might be used for other things as well – but that seems to be the main reason.

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