Pentax LX Original Meter Calibration Tool - Very Rare !

Accurate Measurement PD Ruler - Essential Optical Tool for Medical Professionals

Minolta CR-121 Calibration Reflector Plate - For CR-100/200 Chroma Meters - MINT

DGK Color Tools Digital Kolor Pro 16:9 Large Calibration 0.10, Clear

X-Rite ColorChecker Digital SG Color Calibration Target

Vintage 1961 The Jiffy Night-Light Exposure Conditions ‘Light Meter’ Chart

Vintage Lixtus 2 Light Meter with Leather Case & Chart

Durable PVC PD Ruler: Essential Optical Tool for Pupil Distance Measurement