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Boom Angle Indicator:  4120WWL-12v 

Manual Boom Angle Indicator 4120WWL-12v

  • Backlit for high visibility in low light or night operation

  • Complies with National Fire Protection Association (NFPA) 1901 Standards for Automotive Fire Apparatus:

    20.4 Aerial Ladder Operating Position

    20.4.2 A system that is lighted and marked with labels shall be visible from the operator's position to indicate the elevation, extension, and rated capacities

  • Weatherproof

  • Operational Temperature:  -50 F to +180 F

  • Rugged Polycarbonate Construction

  • Easily installed

  • Sample Photo (4120WWR, right side mount)

  • 4120 General Specifications Brochure

Model 4120 WWL-12V Specificaitons



14"w X 6 3/8"h X 1 3/4"d


Degree Range

-30 through +90


Degree Markings

5 black markings on white background


Case Materials

100% white Polycarbonate 


Tube Construction

Clear Polycarbonate with black ball on white background

MOUNTING POSITION Left hand side of boom  


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Contact Information

Rieker Inc.
34 Mount Pleasant Rd
Aston, PA 19014
Ph: (610) 500-2000
Fax: (610) 500-2002
Toll Free: (800) 497-4523

Copyright 2002-2017 Rieker Inc.  All Rights Reserved.  Updated 05/09/17

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