Hamilton Khaki Field & Fitbit Charge on the same wrist

Hamilton Khaki Field & Fitbit Charge on the same wrist

Yes. The Hamilton Khaki Field is compatible with Smartlet One, with the Fitbit Charge adapter included in the box. The Khaki Field mounts via its 20mm / 22mm / 24mm lug width; the Charge keeps full skin contact on the inner wrist for steps, heart rate, and sleep.
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Compatibility guide

Hamilton Khaki Field & Fitbit Charge on the same wrist

Hamilton Khaki Field + Fitbit Charge
Yes. The Hamilton Khaki Field is compatible with Smartlet One, with the Fitbit Charge adapter included in the box. The Khaki Field mounts via its 20mm / 22mm / 24mm lug width; the Charge keeps full skin contact on the inner wrist for steps, heart rate, and sleep.
Hamilton Khaki Field lug width
20mm / 22mm / 24mm
Fitbit Charge compatibility
Charge 5 / 6
Adapter
Adapter included in every Smartlet box
Sensor accuracy
Fully maintained

Why field watch pragmatists pair the Khaki Field with Fitbit Charge

Liquid error (sections/compat-combo-section line 172): metafield_tag can only be used with a metafield drop

Is the Hamilton Khaki Field compatible with Fitbit Charge on Smartlet?

Compatible
Yes. The Hamilton Khaki Field is compatible with Smartlet One, with the Fitbit Charge adapter included in the box. The Khaki Field mounts via its 20mm / 22mm / 24mm lug width; the Charge keeps full skin contact on the inner wrist for steps, heart rate, and sleep.
Hamilton Khaki Field lug width
20mm / 22mm / 24mm Supported
Standard spring-bar system
Fitbit Charge model
Charge 5 / 6
Adapter included in every Smartlet box
Sensor accuracy
Fully maintained
Inner wrist position
Reversible
In seconds
No modification to the watch

Related compatibility guides

Model guide
Hamilton Khaki Field
→
Brand guide
All Hamilton models
→
Smartwatch guide
Fitbit Charge compatibility
→

More ways to wear Smartlet

Seiko 5 + Fitbit Charge
Seiko 5
→
Seiko Prospex + Fitbit Charge
Seiko Prospex
→

Step by step

Replace your strap
01

Replace your strap

Smartlet replaces your mechanical watch strap via the standard spring-bar system. Classic, Shadow, or Titanium. No tools required.

Connect your wearable
02

Connect your wearable

Smartlet uses a dedicated adapter or native lug pins depending on your smartwatch. The connector snaps onto the Smartlet module. Zero modification to the mechanical watch.

Wear both simultaneously
03

Wear both simultaneously

Both watches sit on the same wrist. All smartwatch sensors maintain direct skin contact and operate normally.

Questions

Frequently asked questions

  • Which Khaki Field references work with Smartlet?
    References across 20mm / 22mm / 24mm lug widths are covered via the standard spring-bar system; the Khaki Field model guide lists each reference.
  • Is the pairing comfortable for all-day wear?
    The Smartlet module follows the wrist's natural shape and the Charge's low profile sits flat on the inner side. Most wearers stop noticing it within a day.
  • Does Smartlet modify the watch in any way?
    No. The attachment uses the watch's own spring bars and reverses in seconds, leaving no trace.
  • Does Smartlet damage or modify my mechanical watch?
    No. Smartlet replaces your standard watch strap using the existing spring-bar system. It makes no permanent modification to the watch case, lugs, or dial. The process is fully reversible in seconds. Your mechanical watch is unaffected and can be worn independently at any time by reinstalling its original strap. Smartlet is engineered to watchmaker tolerances and tested with the same care that goes into the watches it pairs with.