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A-1 Carb or OAT Instrument
Don’t Need Your Glasses To Read
- Large digital backlit display.
Interpret Your Readings Faster
- The digital display allows for quick trend analysis.
Budget Friendly
- Same precision found in the most advanced analyzers on the market, but the A-1 Carb or OAT Instrument won’t break the bank.
Accurate, Dependable & Easy To Use
- LCD sunlight viewable and backlit for night operation.
- Electronics International consistently has been a leader in digital engine instrumentation since 1979.
Questions?
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Product Overview
A-1 OAT Overview

OAT or Carb Temp
Electronics International’s A-1 instrument provides pilots with the precision and stability needed in order to accurately monitor Outside Air Temperature or Carburetor Temperature while in-flight.
Ice Zone Warning
Not only will Electronics International’s A-1 display Outside Air Temp with a stable, one-degree (Fahrenheit) resolution, it also comes complete with an “Ice Zone” light that alerts the pilot when the Outside Air Temperature could possibly contribute to ice forming in the aircraft carburetor.
Reliable Probes
A-1 OAT Kit Includes:
- One (1) P-110F Fast Response EGT Probe
- One (1) P-100 CHT Probe
- One (1) P-128 OAT/Carb Probe
A Monitor is only as good as its probes. That’s why Electronics International (EI) has taken the development of its probes, connectors, and accessories very seriously. EI has been designing and manufacturing probes for over 30 years. All of our probes have been designed in-house by our engineering team. Our team has studied, tested, and designed temperature probes since the 1970′s. They have written research documents such as The Pilots Manual – Leaning and Diagnosing Engine Problems and Accurate CHT Measurements. Just as a Monitor is only as good as its probes, a probe is only as good as its connector. That’s why EI’s engineering team developed EI’s proprietary OLC-1 connector. The OLC-1 connector greatly increases reliability and reduces installation errors as compared to traditional type connectors. Whether you’re looking for a reliable and accurate CHT, EGT, TIT, or various other probe types, EI has what you need. With more than a half million probes sold and tested you can count on EI’s reliability.



Prices
Retail Prices
Package includes:
- A-1 Carb or OAT Instrument
- P-128 OAT Probe
- XP-6′ Precision Thermocouple Cable
- Wire Harness
- Operating & Installation Instructions
Description
Package
Retail Price
A-1 Carb or OAT Instrument
-
$428

Specifications
Specifications
Dimensions
2.5″ x 2.5″ x 3.65″ Deep, 2 1/4″ Flush Mount
Weight
7 oz. (Unit), 1.6 oz for a probe & 2 oz for a 6′ Cable
Power Requirements
7.5 to 30 Volts, 1/10 Amp
Ice Zone Warning
Light is lit when displayed temperature is between 10°F and 39°F.
Display
Viewable in direct sunlight, with dimmable 12 and 24-volt backlight control lines.
Intensity Control
Separate intensity control lines allow you to independently control Ice Warning Zone and Backlight intensity.
Probes
Type K Thermocouple, Ungrounded

Videos
Product Videos
Documents
Documents & Manuals
Testimonials
Customer Testimonials
Haven’t used it yet, but we are excited to & Love the way it looks!!
- Customer
Larry A . From Idaho
- Aircraft
Piper PA-28R-200 Arrow
- EI Instrument
Awesome Tech Support. Like the functions it supports and the fit and look in the panel.
- Customer
Brian M. from California
- Aircraft
Mooney M20F Executive 21
- EI Instrument
I like how the kits ship with everything needed for install and the wire labeling was very helpful.
- Customer
Nathan V. from Alaska
- Aircraft
c-150
- EI Instrument
Your product didn’t feel cheaply made. Overall much better quality with the bezel and buttons and knobs. Also much easier to navigate and add fuel.
- Customer
Justin R. from Texas
- Aircraft
Cessna T207A Turbo Skywagon
- EI Instrument
I like being able to get a hold of a technical expert immediately when calling into the main EI phone number… The build quality of the sensors, display unit and EDC seem very good… I appreciate the business practices of EI and have had an EI R-1 Tachometer which has worked flawlessly for the past 20 years.
- Customer
Eric B. From Texas
- Aircraft
Grumman American AA-5B Tiger
- EI Instrument
I have never had an issue with any EI products… it looks fantastic on the panel.
- Customer
Thomas A. from Oklahoma
- Aircraft
Beechcraft Bonanza E35
- EI Instrument
Currently have multiple EI Instruments in our aircraft. Quality and reliability are key.
- Customer
Jason Y. from Arizona
- Aircraft
Cessna 182A
- EI Instrument
Great product. So easy to read compared to the originals.
I have worked with your products before and I like them.
- Customer
David K. from New Mexico
- Aircraft
Cessna T20N Turbo Centurion II
- EI Instrument
Responsive customer service, kudos to [customer service].
- Customer
James A. From Alabama
- Aircraft
Cessna 182B Skylane
- EI Instrument
[Customer Support was] very responsive and helpful. [I heard about EI through] advice from others. Just about everyone I asked about the CGR-30 loves it and your company.
- Customer
Brett U. from Idaho
- Aircraft
Piper PA-28 S-180 Cherokee
- EI Instrument