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Aircraft Indicators
Backlit Inclinometers
Ball Banking
Bubble Levels
Boom Angle
Slip Indicators
Tilt Switches

About Us

Rieker Inc, a worldwide leader in the manufacturing of quality electronic and mechanical inclinometers, is committed to customer service, product availability, technical support, and performance. Rieker’s technological excellence, supported by continuing substantial investments in research and development, has been the foundation of growth, and helps to ensure quality products for our customers.

> Decades of Manufacturing Experience
> Stock & Custom Made-to-Order Instruments
> International Sales and Distribution
> Multi-cultural and Bi-lingual Staff 

Rieker Manufactures to MIL-I-45208A and MIL-STD-45662

D&B D-U-N-S Number: 002308344

Application Experts:
Angle Indication
Ball Banking Road Curves
Boom Angle
Cross-Slope & Road Crown

Head of Bed Angle
Load Balancing
Machine Alignment
Mast Angle
Pitch & Roll
Percent Grade
Platform Leveling
Process Motion Control
Quick Visual of Angle
Roll Over Early Warning
Slip or Skid (aviation)
Slope Measurement
Vibration Indication
Wheel Alignment


Industries We Impact:
Civil Engineering
Fire & Rescue

Healthcare & Medical
Heavy Industry
Industrial Automation
Lift & Access
Marine & Offshore
RV & Coach
Sound Reinforcement
Sub Sea
Trailer & Chassis
Utility & Bucket


Equipment Solutions For:
Aerial Lift Trucks
Boom Lifts

Buoy Chain Sub Sea Systems
Bridge and Buildings

Bucket/Utility Trucks
Bull Dozers & Earth Movers
Construction Equipment
Conveyor Systems
Cranes & Derricks
Dam & Spillway Gates
Drilling & Boring Rigs
Dump & Tip Trailers
Excavators & Graders
Fire Aerial Ladder trucks

Hospital Beds & Equipment
Material Handlers
Medical Equipment
Military Vehicles
Recreational Vehicles (RV)
Marine Vessels & Sail Boats
Off shore Oil Platforms
Rail Transportation
Satellite & Radar
Scissor Lifts
Solar Panel Array
Speaker PA Line Array
Tractor Trailers
Wind Turbines


Compliance for:
ASME B56.6 Rough Terrain Forklifts
ANSI A92.6 Self-propelled aerial lifts
ANSI A92.5 Boom-supported aerial
lifts (telescoping boom)
ASME B56.7 Industrial Crane Trucks
NFPA 901 Standards for Automotive
Fire Apparatus: 20.4 Aerial Ladder
Operating Position
OSHA 1926.550: Cranes, Derricks,
Hoists, Elevators, Conveyors
OSHA 29 CFR Part 1926 Cranes & Derricks in Construction - Final Rule

Intro Product Catalog

Capabilities Brochure

Full Product Catalog

Product Certifications

Company Profile and Time Line   

Founded in 1917, Rieker Instrument Company Inc began manufacturing high quality inclinometers using hand blown glass tubing to exacting customer specifications.  It's earliest applications were used in the medical and aviation fields, providing accurate quality low cost solutions for measuring tilt and acceleration.

In the early 1920's, the US Government contracted Rieker to produce bubble style pitch and roll indicators for the fast emerging aircraft market.  One of the most famous installations seen in 1920's, was the use of a pair of Rieker glass tube instruments on the panel of the Ryan NYP "The Spirit of St. Louis".  In 1927 Charles Lindbergh chose the lightweight Rieker P-1057 Degree Inclinometer to give him climb and descent angle information.  Rieker's ability to produce precise instrumentation for the aviation industry led to our status as a dominant supplier to Original Aircraft Manufacturers to this day.  Our specialty glass department still hand crafts replacement slip indicators for vintage aircraft around the world. 

One of Rieker's original instruments was the Dare Hemoglobinometer, a handheld instrument used to detect anemia in patients when doctors made house calls.  This device worked by comparing blood samples on slides to red colored glass backlit by a candle.  Precision of specialized hand blown glass made it's mark in manufacturing.  The modern version was used around the world until the mid 1980's.

In the 1960's Rieker developed a line of inclinometers (or clinometer in the marine world) specifically for the sailboat industry, which became the standard in determining heel angle.  Model 2056 was designed with 2 different scales, one to determine whether the boat was loaded level, and the other for heel angle.  With it's dual scales, level of accuracy, durability and cost this particular model remains one of the most popular inclinometers of sailboat owners around the world.  It has been featured on some of the race boats in the America's Cup challenge.

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During the early 1970's Rieker found an emerging market in  the Construction Industry.  This industry was trying to find a simple way to help operators identify when they were transcending too great a slope for the equipment in an effort to prevent a 'tip over'.  Rieker decided that the same technology used in aircraft to determine slip would work to determine tilt.  With some simple modifications the manual inclinometers were outfitted with color zones (such as the 1017SPL models) to help determine Manufacturers recommended safety limits for tilt.  Over the years many versions of Inclinometers were developed along with variations of Gradiometers when percent grade was preferred.  Once the Industry realized that these products worked for the life of the vehicle, and were relatively inexpensive, these indicators were being applied on original equipment worldwide.  

In the 1980's Rieker noticed another angle indicator in the Construction Industry that needed improvement, the pendulum.  A simple indicating device was being used to determine the angle of Lifting Equipment.  On the Boom was a pendulum consisting of a gravity referenced pointer and a decal indicating degrees.  The pendulum had problems of getting stuck when it froze or rusted and the shortcomings of this device were apparent to the industry, however with no alternative.  Rieker developed the 4120 Boom Angle Indicator to alleviate these environmental problems by using the same hermetically sealed technology used by inclinometers to ensure smooth operation no matter what the weather.  This was not only a great improvement in performance but made for fast and easy installation in the field.

The 1990's were a time of electronic automation in general.  In response to this Rieker put it's efforts into developing less expensive ways to indicate tilt, inclination, and acceleration. The SlopeAlert Tilt Warning System was invented to address the issue of roll over for mobile equipment.  The industry had several low cost tilt indicators available, however none performed under the harsh environment of a track vehicle moving over unpaved terrain.  Not only was this unit inexpensive, it worked flawlessly submerged under water, and is shock proof to 500g.  The units were tested for one year prior to production with no evidence that the unit would fail for years to come.  The SlopeAlert units originally purchased then are still in action today!  Rieker worked hard during this time to design and engineer inclinometers and accelerometers that would work for most applications.  Different technologies are used depending on the desired performance and new ones are being developed even as you read this.

Today, Rieker is constantly improving and developing new products that are user friendly, easier to install, and provide multi-functionality (e.g. RDI Series of Digital Inclinometers).  We understand that our customers need tilt indicating devices that simply work, without installation hassles, and are flexible enough to meet their requirements.  To this end we are currently applying our efforts. 

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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
Hours of Operation:
8am-5pm EST

Copyright ©2018 Rieker® Inc.  All Rights Reserved.  Updated 08/17/18

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