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Zehntner Gloss


Inline digital glossmeter
  • Superior accuracy
  • Easy to integrate and use
  • Unmatched productivity


Coatings, plastics and related materials / Calculation of reflection haze H in accordance with ASTM D4039 / In-line production use

Enabling product manufacturers to monitor quality - automatically and continuously
Swiss Made assurance, accuracy, and standards compliance. The fastest instrument in the industry allows the efficient use in production systems.
Ease of use
Measure tight, curved spaces, and in all orientations with ease, thanks to its compact design and tiny bearing area.
A simple yet powerful API and a flexible interface allow a seamless integration into your production environment and full control over the device.

Swiss Made
ZG8150 Tech Specs
Tech Specs
Dual 20°/60° and Single 60°

Measurement modes

Measurement configurations
Contact measurements: with mounted nose
Contactless measurements: without nose having measuring distance of 5 mm / 0.2 in

Error compensation
Stray light compensation
Advanced temperature compensation

Measurement Positioning
Positioning Laser
Viewing Window

All kind of materials such as e.g. coatings, plastic and metals

Measurement range
20°: 0 – 2’000 GU
60°: 0 – 1’000 GU

0.1 GU

0 - 199.9 GU: ± 0.1GU
200 - 2‘000 GU: ± 0.1 %

0 - 199.9 GU: ± 0.5GU
200 - 2‘000 GU: ± 0.4 %

Measurements speed
Up to 20 measurements per second

Measurement time
50ms /Angle

GU, %

Measuring sensor adaption

Measuring area
20°: 3.5 x 4.5 mm / 0.14 x 0.18 in
60°: 3.5 x 6.0 mm / 0.14 x 0.24 in

Opening area
With nose: 10 x 8 mm / 0.39 x 0.31 in
Without nose: 34 x 12 mm / 1.34 x 0.47 in

Bearing area
Nose for flat products: 38 x 24 mm / 1.5 x 0.94 in
Nose for small and curved products: 15.5 mm x 13 mm / 0.61 x 0.51 in

Innovation Award
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What is the difference between the SCAN mode and the CONTINUOUS mode of the ZG8000 Glossmeter?
The ZG8000 glossmeter family (ZG8000 and ZG8150) allows precise gloss measurements at very high speed. The device features two modes for automatic measurements: SCAN mode and CONTINUOUS mode. In the SCAN mode, the device is continuously executing measurements at the highest possible rate. This is depending on the device. The ZG8150 can perform up to 20 measurements per second. In the CONTINUOUS mode, the device is performing repetitive measurements at a predefined rate. This rate is configurable and can be set from 500ms to several seconds.

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.

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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 GB/T 9754-2007 ( Russia )
  • Arrow, click names to download Standards & Guidelines ISO 2813
  • Arrow, click names to download Standards & Guidelines JIS Z 8741