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Air Fuel Ratio (AFR) Lambda Meter



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Air Fuel Ratio (AFR) meter for 'wide band' Bosch LSU4.9 sensors



Wide band Lambda Air Fuel Ratio MeterWide band Lambda Air Fuel Ratio Meter  Air Fuel Ratio Mixture Sensor


Air Fuel Ratio (AFR) meter & display Interfaces to DYNertia3 or data loggers, It can also be used as a rugged professional ‘stand-alone’ unit. A perfect tool for displaying AFR or Lambda, for both tunning and diagnostics.

Laboratory accuracy, workshop tough, portable and economical AFR/Lambda meter!

WB2 includes the latest Bosch LSU4.9 wideband oxygen sensor for reliable and accurate operation, not the outdated LSU4.2 like most competitors are still using.

The built in blue LED display is bright even in direct sunlight and with a flick of a switch the meter displays either Lambda or Air Fuel Ratio (AFR).

High accuracy and fast response are key design features of our AFR/Lambda meter and a range of λ = 0.65 - ∞ (Gasoline AFR: 9.56 to free air) ensures compatibility with different fuel types.

0-5V analogue linear output voltage is generated from a dedicated ’10 bit’ digital to analogue chip for precision and speed, not a cheap filtered PWM signal like many competitors.

The heart of the system is a special Bosch ‘CJ125’ lambda sensor control chip along with an automotive grade microprocessor.  The CJ125 is rarely used in AFR meters due to cost, but Bosch use it wherever an LSU sensor is used in vehicles or even in their own “LT4” controller. Bosch know best when it comes to wideband oxygen sensor control!

Kit Contents-

• Small rugged AFR/Lambda meter with built-in bright LED display
• Bosch LSU 4.9 Lambda (Oxygen) sensor with long lead (1m)
• Long sensor harness (5m)
• Power supply harness (1.5m)
• Sensor ‘weld–in’ plug and bung
• Serial communication cable and dongle (for future updates if required)

 Click on the icon below to view the AFR/Lambda meter manual-

Air Fuel Ratio AFR Meter

Air Fuel Ratio (AFR) Meter Manual



Description Part #
AFR Extension Air Fuel Ratio (AFR) meter extension cable WB2-Ext


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