HBS Smart Lock vs AR Protractor

Haibis intelligent lock based on encryption chip, showing more secure data processing, more convenient visual management operation to bring you a new lock experience.

AR Protractor is a portable measurement tool built on augmented reality that turns your phone into a portable rangefinder, protractor and volume meter. No extra hardware is needed — just open the camera and aim at a flat surface to get accurate measurement results instantly. ## Main Features • Rangefinder: Continuous single-point measurement with real-time display of segment length and total cumulative distance • Protractor: Calculate arbitrary planar angles via three-point measurement • Area Measurement: Two modes available — polygon and circle • Volume Measurement: One-tap calculation for cuboids, cylinders and irregular solids (frustum method) • Unit Conversion: Meters, centimeters, millimeters, feet, inches; cubic meters, liters, cubic feet, gallons • Marker Size Adjustment: Customize the size of measurement markers to suit your usage habits ## Premium Features Two unlocking options: yearly subscription (3-day free trial, cancel anytime, auto-renews yearly) or one-time purchase for permanent unlock. Unlock Angle Measurement, Area Measurement, and all volume features (Box / Cylinder), ad-free. ## Privacy & Support We value your privacy. All AR measurement processing happens locally on your device, and none of your environmental data will be uploaded. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/