How to Measure Gloss with the GLS 7:11
In this video, learn how the PosiTector® GLS Gloss Meter measures gloss, reflectance, and haze in conformance with national and international standards.
Gloss Measurement for Every Finish
The PosiTector GLS Gloss Meter provides quick, reliable measurement of surface gloss, haze, and reflectance across a wide range of finishes—from high-gloss automotive coatings to flat matte ceramics or wood surfaces. With interchangeable probe geometries and integrated calibration, you get consistent readings even when switching between surface types or angles.
Whether you are in quality control, manufacturing, finishing, or inspection, gloss can be a critical factor for appearance, performance, and customer satisfaction.
The GLS allows you to quantify something the human eye often notices but struggles to specify: how light reflects off a surface under different angles, how uniform that gloss is, and whether it meets your standards or specifications.
Features
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Portable gloss measurement – Compact, handheld design for quick, reliable gloss readings on virtually any surface finish.
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Large 2.8″ colour touchscreen – Impact-resistant display with a redesigned keypad for fast, intuitive menu navigation.
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Rugged IP65 enclosure – Weatherproof, dustproof and water-resistant body built for use in demanding shop or site conditions.
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Automatic self-check and calibration – Performs diagnostic tests and auto-calibration at start-up using the protective base plate with integrated calibration tile.
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High-speed readings – Captures more than 60 measurements per minute for rapid inspection of large areas.
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Advanced scan options – Two powerful scan modes (Advanced models) for efficient gloss mapping across extensive surfaces.
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Flexible data transfer – USB, Wi-Fi and Bluetooth connectivity for seamless use with PosiSoft software on PC, Mac or smartphone.
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Certified accuracy – Supplied with a Certificate of Calibration traceable to the National Research Council (NRC) for both the probe and gloss standard.
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International standards compliance – Meets or exceeds ASTM C584/D523/D4039, ISO 2813/7668, JIS Z 8741 and AS/NZS 1580.602.2 requirements.
Why Measure Gloss?
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Consistent Aesthetic Quality — Ensures that painted or coated surfaces have the intended finish and reflective quality, avoiding gloss mismatches.
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Process Control & Job Acceptance — Helps identify coating, application, or surface preparation issues early, reducing waste and rework.
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Brand & Appearance Standards — Many industries specify gloss levels (e.g. automotive, electronics, decorative coatings, architecture) so measurable results are needed.
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Versatility for Different Surfaces & Angles — Some surfaces look different under various viewing angles; measuring at 20°, 60°, or 85° and also measuring haze helps capture those differences precisely.
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Objective, Traceable Data — A gloss meter gives numerical values rather than subjective observation, allowing clear records for audits, comparison or QC.
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Product Consistency Across Batches – Ensures different production runs match in appearance, maintaining brand quality and customer satisfaction.
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Performance Verification – Confirms that protective or decorative coatings meet manufacturer or regulatory specifications for reflectivity and finish durability.
Why Choose DFT?
- DeFelsko Distributor Since 1998 — Over 25 years offering gloss meters, servicing, accessories, spares, and expert advice in the UK.
- Authorised UK Calibration & Service Centre — Local calibration (including calibration tiles and gloss standards), warranty support, and spare parts.
- Complete Product & Accessory Stock — Probes, calibration tiles, cleaning kits, and spare parts held in UK stock for fast dispatch.
- Hands-On Support
From selecting the best probe style (integral, cabled, textured, concrete etc.) to advice on measuring techniques and surface prep, our technical team helps ensure you get the best results out in the field. - Full UK Stock & Fast Delivery – Gloss meters, calibration tiles, and accessories ready for immediate dispatch to minimise downtime.
- Comprehensive After-Sales Support – Ongoing training resources, software guidance, and troubleshooting help from experienced UK technicians.
- Seamless Integration with Other Instruments – DFT can supply complementary DeFelsko gauges, allowing multi-parameter inspection through a single trusted supplier.
Helpful PosiTector GLS Videos
Features & Benefits
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Large 2.8″ impact-resistant colour touchscreen with redesigned keypad and on-gage help.
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Rugged, weatherproof, dustproof IP65-rated body built for shop and field use.
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Probe geometries available: 60°, 20°/60°, 20°/60°/85° to cover high, semi-gloss, matte, and haze-sensitive finishes.
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Fast measurement capability: 60+ readings per minute. Advanced scan modes for large areas (Normal and Statistics modes).
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Auto-diagnosis and auto-calibration using protective base plate with integrated calibration tile.
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Storage: Standard model stores 1,000 readings per probe; Advanced models store 250,000 readings across up to 1,000 batches.
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Hi-Lo alarm, differential mode (compare current reading with stored reference), screen capture, and live graphing (Advanced models) for in-depth QC.
Technical Specifications
| Model/Probe Angles | Measurement Range (Gloss Units) | Measurement Area | Typical Uses |
|---|---|---|---|
| GLS 60° | 0 – 1,000 GU | 10 × 20 mm | Semi-gloss finishes, general QC |
| GLS 20°/60° | 0 – 2,000 GU | 10 × 10 / 10 × 20 mm | High gloss surfaces, coatings, automotive |
| GLS 20°/60°/85° | 0 – 160 GU | 4 × 45 mm / other angles | Matte or flat surfaces, furniture, architectural finishes |
| Standard Body (GLS-XX–1) | As above | Basic storage, essential features | |
| Advanced Body (GLS-XX–3) | As above | Extended memory, scan modes, connectivity |
Repeatability, resolution, reproducibility etc.:
Repeatability: ±0.2 GU (≤100 GU), ±0.2% (>100 GU)
Reproducibility: ±0.5 GU (≤100 GU), ±0.5% (>100 GU)
Resolution: ±0.1 GU for ≤100 GU; ±1 GU for higher gloss values.
PosiTector SPG FAQ’s
What is the difference between measuring at 20°, 60°, and 85°?
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60° is the standard for semi-gloss surfaces.
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If your gloss reading at 60° is above ~70 GU, switching to a 20° angle gives better discrimination for high gloss finishes.
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If reading is below 10 GU at 60°, the 85° angle helps measure matte or low gloss finishes more accurately.
What is the Haze Index and when is it used?
Haze Index (according to ASTM D4039) is the difference between gloss readings at 60° and 20°—useful when there is a milky or hazy bloom on a surface even if the gloss seems high. Only certain models/probes support haze calculation.
How do I maintain accurate readings over time?
Keep the calibration tile clean, store multiple calibration standards if needed, use the auto-calibration where available, and regularly check against known gloss standards.
What environmental conditions affect gloss measurement?
Temperature and humidity can affect reflectivity and sensor performance. The GLS operates reliably between 0°–45 °C (32°–113 °F) in non-condensing conditions. Ensure surface is clean and free of dust or moisture.
How many readings can I store and how do I access them?
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Standard bodies store ~1,000 readings per probe.
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Advanced bodies store up to ~250,000 readings across batches.
Data can be downloaded using USB or sync via WiFi or Bluetooth in Advanced models.
Does the GLS wrist strap / holster / protective gear matter?
Yes — protecting the probe, display, and calibration tile from drops or impacts, and keeping surfaces and optics clean helps maintain precise performance.
Still need help?
If you experience an issue, check our troubleshooting guide or contact our support team directly. As a DeFelsko Authorised Service Centre (DASC), DFT Instruments provides calibration, repair, and technical assistance locally in the UK.
Find out more about the PosiTector GLS and all the features that come with it
What’s Included:
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GLS Gloss Meter probe and selected body (Standard or Advanced)
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Protective base plate with integrated gloss calibration tile
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10 cleaning wipes
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Protective rubber holster + lens shield + wrist strap
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3 × AAA batteries
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USB cable for data download
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PosiSoft software (Desktop, App, etc.)
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Hard-shell protective case
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Long-form Certificate of Calibration
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2 year warranty
Make your gloss measurement precise, repeatable, and auditable. The PosiTector GLS gives you the tools to ensure every finish shines to spec — whether automotive, architectural, industrial or decorative.
📞 To enquire about this product, contact our team today on: 01442 879494 or Complete the form.
PosiTector GLS Price:
PRICES FROM £1,400
