Konica Minolta PDA-100 Density Range: 0.0 - 4.0 D Aperture: 3mm Accuracy: ±0.03 DX-Rite 5-Step Density Strip 5 Step Density Strip Certified ESECO 5-Step Tablet 5 Step Density Strip Certified ESECO 21-Step Tablet 21 Step Density Strip CertifiedAgfa 15-step Density Strip 15 Step Density Strip CertifiedESECO SM-12 Density Range: 0.00 - 4.0 D Aperture: 3mm Accuracy: ±0.02 D or 1%X-Rite 331C Portable Densitometer Density Range: 0-4.0D Aperture: 1mm,2mm Accuracy: ±0.02 DESECO SM-14 Density Range: 0.00 - 4.0 D Aperture: 3mm Accuracy: ±0.02 D or 1%LCNDT DT-100 Densitometer Density Range: 0 - 4.5 D Aperture: 3mm Accuracy: ± 0.03 DLCNDT DT-200 Separate Probe Densitometer Density Range: 0-4.5 D Aperture: 3mm Accuracy: ±0.03 DESECO Speedmaster SM-10T Density Range: 0-5.0 D Aperture: 2mm Accuracy: ±0.02 DNDT DM3011 Densitometer Density Range: 0.0 - 5.0 D Aperture: 2mm Repeatability: ±0.01 DX-Rite 301 Transmission Densitometer Density Range: 0-5.0D Aperture: 1,2,3mm Accuracy: ±0.02 D