The Murphy® L129 Series Lube Level Swichgage™ instrument is a combination lube level indicating gage and adjustable low and high limit switches. L129 Series Lube Level Swichgage™ can monitor and protect your engines, compressors pumps from improper lubrication level, which can result in extensive damage. When the high or low limit contact is reached, a normally open circuit will be completed which can activate alarms and/or shutdown the equipment.