Watch Spring vs Calipers Tape Measure

Track. Analyse. Enjoy.  Track mechanical watch accuracy and see drift over time. Log quick time-points, visualise trends with simple charts, keep notes about watch details, track service history, and balance your wrist time across your collection. Why it’s useful • Understand seconds-per-day accuracy and long-term behaviour • Spot issues after knocks or before/after a service • See which watches get the most wear • Keep track of key facts about your watches in one place Features • Accuracy charts & trend • Wear calendar & statistics • Watch collection summary shown as info cards; for a quick snapshot of key facts • Log servicing and repairs with notes and dates; see the before/after impact on accuracy • View your watch ownership history timeline • Time-setting clock (seconds-accurate) • Daily reminders • Import/Export CSV; share charts • iPhone-native, no ads, data stays on device How it works 1. Press and hold on the on-screen clock 2. When your watch matches the time, lift your finger 3. Watch Spring logs the time-point, updates charts, and marks your wear

Calipers lets you take measurements when you're on the go. For the big things, there's 5 meter tape measure. Simply place your iPhone on a surface so the ‘zero’ aligns with where you want to start your measurement. Next, place a finger near the bottom of your iPhone and slide your iPhone along the surface, keeping your finger still. Finally, when your finger reaches the top, repeat the process again until you’ve completed your measurement For the little things, the calipers mode will let you measure objects within a tenth of a millimeter. Simply place an object on the screen, and drag the top and bottom guides until they are just visible. To get really accurate readings, you can use the ‘plus’ and ‘minus’ buttons to move the guides closer or further apart by a 1/10th of a millimeter. 6 out of the top 10 free apps in this category are off by as much as 10% on the iPhone 12 & 13 Mini, or when some accessibility features are enabled. Since most people don't check their app against a ruler - we felt it was really important we did! This app has been throughly tested to ensure the measurements are accurate in every scenario.