Type segmentation dissects the Drug Transdermal Diffusion Tester market into three principal instrument architectures: Franz diffusion cells, Flow‑through diffusion cells, and Static diffusion cells. Franz cells dominate the market due to their long‑standing validation in academic and early‑stage pharmaceutical research, accounting for roughly 55% of total unit sales. Flow‑through cells, characterized by continuous perfusion and superior kinetic control, capture about 30% of the market, driven by mid‑size biotech firms that require higher throughput and reproducibility. Static diffusion cells, offering a sealed environment for equilibrium studies, represent the remaining 15%, primarily serving niche applications such as formulation stability testing. Each architecture contributes distinct cost structures, maintenance cycles, and data fidelity levels, which collectively shape the overall market size. The relative pricing premium of flow‑through systems offsets their lower volume, while the widespread adoption of Franz cells sustains a stable revenue base, illustrating how the Drug Transdermal Diffusion Tester segmentation by type underpins market dynamics.