Name: Caliper: True-Size Circle Gauge and Ruler
Author: zepto

Caliper draws a circle on your watch screen at true size, so you can lay a screw, coin, bead or small part on the glass and see if it matches. Size it with the + and - pads, read it in inches or millimeters, and lock the screen while you compare.

FEATURES
- A true-size amber ring, scaled to your watch's screen
- Tap + or - for exact steps: 1/16 in or 0.1 mm
- Hold + or - to grow or shrink the ring smoothly
- Inches show as a fraction with the decimal (3/8", 0.375 in), or choose millimeters
- Presets for coins, screws and bolts (M2 to M12, #4 to #10, 1/4" to 1/2"), batteries and LEDs, shown at their exact size
- Enter a size directly with a number picker
- Lock icon: tap it and the screen ignores every touch, so an object resting on the glass can't change anything
- Optional fine tune with a coin for extra accuracy

HOW TO USE
Tap the + and - pads on the sides of the screen, or press UP and DOWN. Hold a pad to change the size quickly. Swipe up or down to switch between inches and millimeters. Tap the padlock at the top (or press START) to lock the size, then place your object on the screen. Hold the screen or swipe left for presets, Enter a size, and fine tune.

ACCURACY
The ring is scaled from your watch's screen resolution and is accurate to about 1/16 in. Hold the object flat against the glass and look straight down. For extra accuracy, use Fine tune with a coin from the menu.

Also from the same developer: Ion, Sockets and Heartworks watch faces, and the Morse Beacon app.