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Dioptra™ Lite - a camera position and angle measurement toolfornavigation, surveying, positioning, and measurement - - withover35,000 users! Stay tuned for an enhanced Dioptra app in 2020withmore features, better sharing integration, and supportingmorephones and devices! Instructions: Press the on-screen camerabuttonto save an image. View saved images in your device's galleryapp.[⊹] Dioptra™ Lite provides the following information likeatheodolite optical instrument - • yaw indicator (compass) •pitchindicator (tilt degrees) • roll indicator (tilt degrees) alongwith- • GPS position • azimuth and bearing to photo subject Theancientgreek "dioptra" was a classical astronomical andsurveyinginstrument, dating from the 3rd century BCE. The dioptrawas asighting tube or, alternatively, a rod with a sight at bothends,attached to a stand. If fitted with protractors, it could beusedto measure angles. [⊹]

Use retro-reflection to find hidden cameras, dropped parts, orcontact lenses!