How to choose the right spectrophotometer

Quick answer: To choose the right spectrophotometer, decide on 5 things: (1) measurement geometry — 45°/0° or d/8°; (2) portable or benchtop; (3) your sample type and industry; (4) SCI/SCE and aperture; (5) the software and standards you must meet. Getting this right keeps results consistent batch-to-batch and between lab and production.

1. Measurement geometry: 45°/0° or d/8°?

This is the most important decision because it directly affects the numbers you read.

• 45°/0° reflects colour as the human eye sees it in normal light — best for flat, matte or textured surfaces.
• d/8° (integrating sphere) lets you include or exclude gloss (SCI/SCE) — best for colour formulation, glossy, curved or translucent samples.

Many BYK‑Gardner instruments such as Spectro2go and Spectro2guide come in both versions so you can match the application.

2. Portable or benchtop?

Portable units are flexible for the shop floor and production line; benchtop units offer the highest accuracy and repeatability in the lab. We cover this in detail in Portable vs benchtop spectrophotometers.

3. Your sample type and industry

Paint & coatings, plastics, automotive, wood/MDF, coil coating, printing — each has different needs. Textured plastic/wood samples call for a larger aperture; automotive parts need colour control between plastic and metal.

4. SCI/SCE and aperture

• SCI (specular included) — for controlling formulation and material colour.
• SCE (specular excluded) — reflects appearance as the eye sees it.

Match the aperture to the size and uniformity of your samples.

5. Software and standards

Choose an instrument that supports ΔE (ΔE*ab, ΔE00), Pass/Fail colour tolerances, and complies with ASTM/ISO/CIE. Software such as smart-chart enables QC reporting and digital colour communication with customers.

Simple rule: choose the instrument by your application and material, not just the spec sheet.

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