A sight glass used for observing safety indication lamps of an aerial lift device with insulated arms

A sight glass used for observing safety indication lamps of an aerial lift device with insulated arms relates to the field of power distribution working, and solves problems that operation personnel in the aerial lift device with the insulated arms can not observe states of the safety indicating lamps. A main body of a lens body is a cuboid, and wide edges of the cuboid are both circular-arc-shpaed. One of a long edge of the cuboid is provided with a circular-arc-shaped projection. A fixing seat is a cylinder, and is provided with a circular hole in the middle portion. A rotation ball is in fixed connection with one end of an L-shaped support bar. The rotation ball is positioned in the circular hole. The fixing seat is in fixed connection with the back surface of the lens body. A vertical support is in fixed connection with an inclined support. An included angle between the vertical support and the inclined support is 60-degrees. The bottom end of the vertical support is provided with a fixing sheet. The bottom end of the inclined support is provided with a fixing sheet. The middle portions of the fixing sheets are provided with circular holes used for screwing the fixing sheets tightly into a body of the aerial lift device with the insulated arms through bolts. The L-shaped support bar is in threaded connection with the vertical support of an extension support through a nut. The sight glass is suitable for being used as a rearview mirror.