Flagger vs PD Meter

FLAGGER - REACTION TIME TRAINER Master your racing starts and improve your reaction times with Flagger, the ultimate drag racing reaction trainer and performance analyzer. Whether you're a professional racer or just getting started, Flagger helps you perfect your launches and analyze your performance with precision. KEY FEATURES: REAL-TIME G-FORCE MEASUREMENT Track your vehicle's acceleration with advanced motion sensing technology, giving you detailed insights into your launch performance. MULTIPLAYER RACING Challenge friends to head-to-head races or practice sessions. Create race rooms and share them easily with a unique code. PROFESSIONAL GRADE ANALYSIS Get detailed breakdowns of your: Reaction times Peak G-force Launch consistency Performance trends CUSTOMIZABLE PRACTICE Adjustable countdown timers Choose between MPH or KM/H Practice different tree configurations RACE HISTORY Keep track of your progress with detailed historical data of all your runs, helping you identify patterns and improvements. SOCIAL FEATURES Share your results Compare performances Challenge friends Perfect for: Drag racers Motorsport enthusiasts Racing teams Driver training Performance tracking Download Flagger now and start improving your reaction times and launch performance!

Ordering glasses online and need your PD? PD Meter helps you measure your pupillary distance (PD) in millimeters using a front-camera selfie and any standard-size card, like a credit card, for scale — no ruler, no second person, no trip to the optician. Your pupillary distance is the gap between the centers of your pupils. Online eyewear stores ask for it so your lenses are centered correctly in the frame. PD Meter gives you a quick, repeatable estimate from the comfort of your home. HOW IT WORKS • Hold a standard card (a credit card, ID or any ISO-size card) under your eyes — its known width gives the app a real-world scale. • Take a front-camera selfie, looking straight at the lens. • Mark the center of each pupil and the edges of the card. • PD Meter converts pixels to millimeters and shows your PD instantly. WHAT YOU GET • PD in millimeters, ready to enter at checkout. • Single (binocular) PD, the value most retailers request. • A clear, guided flow with on-screen tips for good lighting and head position. • Re-measure as many times as you like and average your results for confidence. WHO IT'S FOR Anyone buying prescription or blue-light glasses online, parents checking a child's fit, or anyone who simply wants their PD on hand without booking an appointment. A NOTE ON ACCURACY PD Meter provides an estimate based on your photo and the card scale. Results depend on lighting, camera angle and how precisely you place the markers. For high prescriptions or progressive lenses, confirm your PD with an optician. This app is not a medical device.