Fixture data. The watches, makers, studies, shops and figures on this page are invented for testing. None of it is a real finding, so please don't rely on it or try to buy anything.

TechSussd

Fixture Maker B

Fixture Watch 4

Model number FXB-4

What the published evidence says about this watch, metric by metric. Every accuracy, compatibility and specification fact on a device page links to its source and shows its date. How we grade it.

Accuracy evidence

  • Heart rate at rest

    Validated

    1. Measured at rest in 32 people, against a reference of ECG chest strap: error of 3% (mean absolute percentage error). Meets our threshold.

      At seated rest, Fixture Watch 4 showed a mean absolute percentage error of 3.0%.

      Study grade
      A · Peer-reviewed
      Funding
      Independent funding.
      Read
      Retraction check

  • Heart rate in steady exercise

    Unvalidated

    No published test we can use yet. That's not proof it's poor, just no evidence either way.

  • Heart rate in interval exercise

    Unvalidated

    No published test we can use yet. That's not proof it's poor, just no evidence either way.

  • Step count

    Unvalidated

    No published test we can use yet. That's not proof it's poor, just no evidence either way.

  • Energy expenditure

    Unvalidated

    No published test we can use yet. That's not proof it's poor, just no evidence either way.

  • Sleep duration

    Unvalidated

    No published test we can use yet. That's not proof it's poor, just no evidence either way.

  • Sleep staging

    Unvalidated

    No published test we can use yet. That's not proof it's poor, just no evidence either way.

  • VO2max estimate

    Limited

    1. Measured in steady exercise in 30 people, against a reference of metabolic cart: error of 8% (mean absolute percentage error). Meets our threshold.

      Commissioned by Fixture Maker B, this study compared the Fixture Watch 4 VO2max estimate with a metabolic cart in 30 adults and found a mean absolute percentage error of 8.0%.

      Study grade
      A · Peer-reviewed
      Funding
      Funded by the maker. Commissioned by Fixture Maker B.
      Read
      Retraction check

  • GPS distance and pace

    Unvalidated

    No published test we can use yet. That's not proof it's poor, just no evidence either way.

Works with your phone?

  • Android, pairing: Works. Needs Android 10 or later.

    Maker states Fixture Maker B: watches, checked

    Fixture Watch 4 pairs with Android phones running Android 10 or later.

  • iPhone, pairing: Doesn't work.

    Maker states Fixture Maker B: watches, checked

    Fixture Watch 4 does not pair with iPhone.

Check it against your phone

Specification: claimed and measured

Subscriptions

Where to buy

A price we checked more than 6 hours ago is shown as last seen, not as current. Prices are the delivered total where the retailer tells us delivery; otherwise we send you to see the price there.