Tempest AT5K Aviation Spark Plug Resistance Tester   

Know when to replace your Spark Plugs!

Measures between the terminal inside the lead and the spark plugs' center firing tip.

• Follows MIL-S-7886
• Prevents misfiring, wasted fuel, and pollution

AT5K means: “At 5000 Ohms” change that plug!

The Tempest AT5K quickly and accurately checks spark plug resistors and quickly displays the results.

Green only - Excellent

Green and Red - Serviceable

Red only - Replace with a new Spark Plug

Note: The AT5K only checks resistance values. It does not replace, nor is it a substitute for, other tests required to determine a spark plug’s condition.

Checking Spark Plug resistance is important!

Excessive resistance causes:

• Hard starting
• Skipping, missing, excessive fuel consumption and pollution
• Roughness in turbocharged engines
• Roughness during lean of peak operations
• Roughness at high altitudes
• Spark plug fouling
• Engine oil contamination from excessive carbon and unburned fuel entering the crankcase
• Unnecessary electrical stress on ignition leads, contact points, capacitors and magnetos
• Costly, unnecessary spark plug maintenance

Check resistance prior to installation:

New spark plugs without monolithic resistors may drift out of range even before being entered into service. Install Tempest Spark Plugs with monolithic solid state resistors!