SVG3 - Easy View Digital Micron Vacuum Gauge w/alarm. The SVG3 Digitial Micron Vacuum Gauge is a compact rugged gauge that is loaded with features HVACR professionals need to help them do more. It includes a large dual display with a rate indicator alarms timer rugged rubberized case and a hook at strap that allows the vacuum gauge to be hung at any angle. The SVG3 contains features to make evacuations easier and faster. The display has a bright backlight for high visibility in any situation. To minimize leaks the SVG3 has a schrader depressor that can connect directly to your core removal tool or directly to the service port. Fewer connections reduce the potential for leaks unrelated to the system. The rate indicator helps determine if there are any leaks within the system. When the vacuum reaches the low alarm set point an audible alarm triggers the backlight flashes and the integrated stopwatch restarts to show the technician how long the system has maintained a deep vacuum. You can set both high and low alarms. And the timer can display how long it took to get to the alarm and how long the vacuum has been maintained.