Measurement Support - Lumo Cuff

Lumo ▸ Lumo Cuff
1. Forearm Length
2. Wrist Size
3. Offset
4. Result

Measure Forearm Length (L)

Measure the distance from the elbow crease to the wrist with a tailor's measuring tape. The Lumo Cuff requires L ≥ 120 mm — there is no maximum length.

Tailor's measuring tape
Measure forearm length
mm
Elbow crease → wrist
L < 120 mm — the Lumo Cuff is not suitable. Contact support@macu4.com for a Lumo Socket or custom solution.

Measure Wrist Circumference (C2)

Measure the circumference at the wrist with a tailor's measuring tape, then enter the value below. The app will recommend the matching cuff size.

Tailor's measuring tape
Measure wrist circumference
mm
Measure at the wrist (narrowest point)
Size STD-SML 100 – 120 mm Wrist Circ.
Size STD-MED 120 – 140 mm Wrist Circ.

Measure Length Difference (D)

The Lumo Cuff has an integrated offset built into each design size. Place both elbows at the same height and measure the difference between the wrist positions, then enter the value below. The app will recommend the matching offset variant.

Tailor's measuring tape
Length difference (D)
mm
Difference between affected and non-affected wrist positions
Offset A 0 mm
Offset B 20 mm
Offset C 40 mm
Offset D 60 mm
Offset E 80 mm

Your Lumo Cuff Recommendation

Based on your measurements, here is the cuff configuration to order:

Cuff Size
—
Integrated Offset
—

Lumo cuff sizing table

Cuff size by wrist circumference (C2). The Lumo Cuff requires forearm length L ≥ 120 mm.

Cuff sizeWrist circ. C2 (mm)
STD-SML100 – 120
STD-MED120 – 140

Length-compensation spacer sizes (offset for arm-length difference D):

SpacerABCDE
mm020406080

Provisional sizing — pending final approval.

Tips

  • If L < 120 mm or C2 < 100 mm, contact support@macu4.com for a custom solution.
  • For long forearms where a Lynk Cuff is preferred, the Lumo modules can still be used via a Clic Module adapter.
  • The offset is integrated into the cuff design — contact macu4 if you are unsure which size best fits the user.