The O2 Alert is the first date-recording system specifically designed to record air/fuel ratios with a warning output.
Features

Records air/fuel ratio, engine RPM, battery voltage, and up to two wideband oxygen sensors (sold with 1, pictured with 2)

Start recording by using a preset RPM value or switch

Two hour recording time

Adjustable rate of up to 100 samples per second

Unit measurements: 4" x 3.25" x 1.25"

Durable aluminum extrusion housing with backlit display

No personal computer needed (real time & saved data shown)

Windows-compatible software has graphing capability

Programmable warning output protects against "lean out" and can also be used to activate
warning lights, enable fuel enrichment, shut down a nitrous or ignition system, and retard timing

This upgradable O2 Alert System includes software and one wideband oxygen sensor. It has options for an additional wideband oxygen sensor (pictured), an EGT thermocouple, air/fuel voltage output, and two analog inputs (pressure, flow, position, etc.).