5× Internationally Awarded · Patented

The folding ruler
that measures diameter.

KNAKKE — the only folding ruler in the world with a unique diameter scale. And your personal advertising space.

For Businesses
Promotional Item with Logo
Custom printing from just 1 piece. Perfect for trade shows, clients & team.
Design now
For Individuals
Personalised Gift
Create your personal KNAKKE — as a gift or for yourself.
Design your KNAKKE
33 cm
Max. Diameter
5×
Gold International
±1 mm
Accuracy
2m
Centimetre Scale
The KNAKKE folding ruler unfolded into an equilateral triangle around a cylinder
Discover more
5× Gold International Invention Fairs
Patented Unique invention worldwide
STABILA Quality Premium beechwood
Custom printable Logo · Photo · Text · Slogan
01 — What Makes It Special

Two rulers in one.

Front side: the familiar STABILA folding ruler. Back side: a patented invention unlike anything else in the world.

The video shows how to measure the diameter of a round object using the KNAKKE folding ruler in three steps: (1) Unfold the ruler into an equilateral triangle — coloured edges facing inward. (2) Press all three sides firmly against the object, e.g. a pipe or round rod. (3) Read the diameter directly from the green scale — the arrow indicator shows the exact value in centimetres. For inch measurement, slide the indicator into the white scale area. Measuring range: 1 segment up to 10 cm, 2 segments up to 20 cm, 3 segments up to 33 cm diameter.

Ø 120mm Skala ablesen
Diameter up to 33 cm — right on the job site
No calipers needed. Simply unfold into a triangle, place around the object, read the scale. 1 segment: up to 10 cm · 2 segments: up to 20 cm · 3 segments: up to 33 cm.
Dual scale for diameter: cm and inches
Green scale for centimetres, white area for inches. Simply slide the arrow indicator.
Front side: ±1 mm measurement accuracy —
EC type-approval certificate. CE-certified. Spring steel joints and STABILA beechwood. Professional tool, no compromises.
02 — Technical Details

Precision in every detail.

33 cm
Maximum diameter
measurable (13 inches)
±1 mm
Measurement accuracy
2 m
Front side length
Standard folding ruler
cm + in
Diameter scale with
centimetres & inches
Material
STABILA beechwood, spring steel joints
Front side
Centimetre scale (incl. drywall graduation) with CE and metrology markings plus EC type-approval certificate
Back side
Patented KNAKKE® scale for diameter measurement in cm and inches
Max. diameter
33 cm — 1 segment: up to 10 cm · 2 segments: up to 20 cm · 3 segments: up to 33 cm
Printing
Side panels printable with logo, photo, text or slogan
03 — How to Use It

Three steps to the diameter.

The principle is brilliantly simple — and surprisingly accurate.

1
Coloured edges facing inward
Unfold the ruler into a triangle. Make sure the coloured edges are on the inside.
2
Press all sides firmly
Place the ruler around the object. All three sides must be firmly in contact with the object.
3
Read — done
Read the diameter from the green scale. Move the arrow into the white area for inch measurement.
→ Inch reading also possible
Step 1 – Unfold
Coloured edges face inward
Step 2 – Place
All three sides touch the object
Step 3 – Read
Green scale shows the exact diameter
04 — Awards

5× Internationally
awarded.

Selected by expert juries at the world's most prestigious invention fairs.

🏅
Europa
Grand Prix Européen des Inventeurs
🥇
Deutschland
iENA Gold · Nürnberg
🏆
Frankreich
1. Preis F.F.I.
Châlons-en-Champagne
🥇
Schweiz
Geneva Inventions 2014
🏅
Russland
Sonderpreis RIHSTC · iENA Nürnberg
05 — On Television

KNAKKE® on TV.

Featured on MDR – praised by experts and editors alike.

MDR · Einfach genial · 10 Feb 2015
"Simply Brilliant"
MDR presents KNAKKE in its "Einfach genial" series – the show for clever inventions and innovative ideas.
Thuringia Innovation Award · 2014
Audience Award – Thuringia Innovation Prize
KNAKKE wins the Audience Award at the 2014 Thuringia Innovation Prize.
MDR Thüringen Journal · iENA · 28 Oct 2014
MDR Thüringen Journal iENA
MDR Thüringen Journal reports on KNAKKE at iENA 2014.
06 — Customisation

Your KNAKKE. Your Design.

Side panels fully printable. Logo, photo, text, slogan — in your brand identity. Design online, order immediately.

knakke-designer.de

Design your KNAKKE
in the Online Designer

For businesses from just 1 piece, bulk orders on request. For individuals as a personalised gift. Live preview, order immediately.

Design & order now
For businesses & individuals · from 1 piece
KNAKKE Designer – screenshot of the online configurator in a browser on a desktop monitor KNAKKE Online Designer – customise the folding ruler with logo and text

Ready?
Let's go.

Design your KNAKKE online — or order directly. Fast, simple, with live preview.

Design in the Online Designer →
07 — Contact

Get in
touch.

Questions about the product, dealer enquiries or custom orders — we are happy to help.

Phone
+49 (3634) 31 55 400
Email
info@knakke.de