The ICON™ R134A A/C Manifold Gauge Set is designed for quick A/C charging, diagnostic checks, and recovery work. The 3-1/8 in. gauge maintains accuracy within +/- 2% of span for the first quarter of scale, +/- 1% of span for the middle half of the scale, and +/- 2% of span for the last quarter of the scale. The premium carrying case converts into a storage tray that easily fits into most tool drawers to keep your workspace organized and clutter-free.