Each detector has a built-in pump and comes with A-CAL and N-CAL firmware, metal gooseneck probe (GP-514), dust & water block filter (WF-501), set of batteries, carrying case (IC-501), and operating manual. Detector weighs 1.50 pounds (0.68 Kg.) has a three push-buttons, LCD display of 0 - 100% LEL, 0 - 100% GAS, 0 - 10,000 ppm GAS in 20ppm increments, and 0 - 40% oxygen. A set of two C batteries provides power. Bar Hole mode displays peak and sustained bar hole gas readings. The EGO-321 auto ranges between %LEL and %GAS, while the EGO-322 always displays %GAS.
