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Zehntner Gloss

ZOL 1150

Tailored Industrial Gloss Measuring System
  • Inline
  • Automized
  • Fast and Precise


In-line quality control in production / Coatings, plastics and related materials / High gloss (20°), Medium gloss (60°), Low gloss (85°)

Automized gloss-measuring system for industrial inline quality control. Contactless measurement of all gloss ranges from matt to high gloss up to 2‘000 GU.
Continuous recording of the gloss values with a big measurement area is optimized for inline quality control in industrial production.
Great handling
Unique automatic in-situ calibration simplifies the handling and minimizes holding times significantly Automatic measuring distance correction ensures precise and contactless measurements.
Online monitoring of gloss and glosshaze during the production with up to 1‘000 measurements per second. Swiss quality ensures maximum accuracy.

Swiss Made
ZOL 1150 Tech Specs
Tech Specs
20°, 60°, 85° (depending on the version)

Measuring accuracy
0 - 199.9 GU: ≈0.2 GU, 0 - 1999 GU: ≈2 GU*

Measuring area
20°: 22 mm x 20 mm (0.87” x 0.79”)
60°: 29 mm x 14 mm (1.14” x 0.55”)
85°: 114 mm x 11 mm (4.49” x 0.43”)


Analog output
0-10 V, 0-20 mA or 4-20 mA

Light source

Power supply
24 VDC, ±10%

Power consumption
max. 18 W

Operating Temperature
-10°C to + 50°C (12 °F to 122 °F)

Measuring distance to material Measuring position
20°/60°: 10 mm (0.39”)
85°: 2.7 mm (0.11”)

Dimensions measuring head
20°/60°: 339 mm x 142 mm x 243 mm
20°/60°: 13.35” x 5.59” x 9.57”
85°: 339 mm x 142 mm x 250 mm
85°: 13.35“ x 5.59“ x 9.84“

Innovation Award

What is specular reflection or specular gloss?
A specular reflection or gloss is what you get from a polished surface or mirror. It is clear, and you can see "through" the mirror. A diffuse reflection is what you get from a white wall. The light is bounced off it, but in random directions, so you cannot see the light source in the reflection. Many surfaces will be a mix of specular and diffuse - e.g. a smooth desktop will give both kinds of reflection. A polished surface gives more specular reflection and less diffuse reflection.

What is a measurement angle?
Measurement angle refers to the angle between the incident light on a surface and the line perpendicular to the surface at the point of incidence. In specular reflection the incident and reflected angle are identical. Typically, three measurement angles (20°, 60°, and 85°) are used to cover the majority of industrial coatings applications (Figure 1). The angle is selected based on the anticipated gloss range. Some measurement instruments offer the option to measure multiple angles at the same time.

What difference in gloss units is visible to the human eye?
There are no distinct differences in gloss units for the human eye to point out between the two samples. The detectable differences depend on the gloss level of the sample e.g. 3.0 GU difference measured on a very matte surface (perhaps 5GU), would be seen by the human eye but on a higher gloss coating (perhaps 60 GU) the difference would be very difficult to notice.  For a dedicated product the tolerances have to be evaluated experimentally (by end users tests of your coatings or internal "experts"). Another good option is the use of a 20/60/85 degrees instrument, which show more equality to the gloss differences due to the three measurement angles. Experience shows that a gloss difference of 5 GU, when measured with the correct geometry is just visible to a trained observer.

How is gloss measured?
Gloss is the opti­cal proper­ty of a sur­face to reflect light into the specu­lar direction, an important appear­ance factor. The visual impres­sion of gloss is depen­dent on the individual per­ception, there­fore the gloss values are deter­mined using gloss­meter. A Glossmeter directs a light at a specific angle to the test surface and simultaneously measures the amount of (specular) reflection.

Why use a glossmeter?
A glossmeter is a precision measurement instrument. In order to determine the gloss of a surface, the glossmeter projects a beam of light at a fixed intensity and angle onto a surface and measures the amount of reflected light at an equal but opposite angle.

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Standards & Guidelines


  • Arrow, click names to download Standards & Guidelines ASTM D2457
  • Arrow, click names to download Standards & Guidelines ASTM D523
  • Arrow, click names to download Standards & Guidelines BS 3900-D6
  • Arrow, click names to download Standards & Guidelines DIN EN ISO2813
  • Arrow, click names to download Standards & Guidelines ISO 2813
  • Arrow, click names to download Standards & Guidelines JIS Z 8741