Freon pressure gauges are used in refrigeration appli cation for testing, semicing,and recharging. Our dial fea- tures R-12, R-22 and R-502 OR R-304 scale. Recalibrator and restrictor as standard features. SPECIFICATIONS CASE SIZES: 2.7"(68mm) 3.15" (80mm) CASE MATERIAL: Steel with red & blue color TUBE: Phosphor bronze SOCKET&MOVEMENT: Brass CONNECTIONS: 1/8" &I/4"NPT in LM bottom dependent on model&size, bottom, back,left&right side AVAILABLE RANGES: 30"Hg VAC to 150 psi retard to 350 psi:0-500 psi WINDOW (LENS) MATERIAL: Threaded polycarbonate lens. ACCURACY: ASME B40. t Grade B (3-2-3%) OPTIONS&ACCESSORIES: Custom dial, metric scale, DIN 2,5% accuracy, special connections and more.