AUTOOL SPT360 Spark Plug Tester 5-Hole 200–9000RPM 12V with Digital Display & Adjustable Height

The AUTOOL SPT360 is a 5-hole, 12V spark plug tester with adjustable RPM simulation (200–9000RPM) that lets you compare spark strength and stability on up to five plugs at once for fast ignition diagnostics.

This compact bench-style tester reproduces engine-like firing speeds and displays precise frequency settings so you can spot weak, inconsistent, or faulty spark plugs before they cause drivability issues. Built for garages, home mechanics, and fleet technicians, the SPT360 pairs a clear digital readout with a protective cover and safety interlocks to make high-voltage testing straightforward and safer than improvising with ad hoc setups.

How does the adjustable RPM range help diagnose spark plugs?

Varying the simulated RPM mimics real operating conditions so you can see how a plug behaves under different firing rates. Higher frequencies produce stronger sparks for testing intensity, while lower speeds reveal intermittent misfires or weak ignition under slow-cranking conditions.

• Adjustable 200–9000RPM to simulate idle through high-load firing.
• Fine-tune with plus/minus controls and view exact frequency on the digital display.
• Use higher RPM to test spark intensity; lower RPM to detect intermittent faults.

Can I test multiple cylinders at once, and what plugs fit?

The SPT360’s five-bay design lets you inspect up to five spark plugs simultaneously, making side-by-side comparisons quick and reliable. Each hole accepts standard 12mm 12V gasoline spark plugs and includes an 8mm height adjustment to handle various plug lengths and seat depths.

• Five test holes for multi-cylinder comparison and consistent evaluation.
• 12mm diameter compatibility with common 12V spark plugs used in cars, motorcycles, and marine engines.
• 8mm vertical adjustment to accommodate varying plug lengths and styles.

What safety and protection features are included?

A transparent protective cover must remain closed during high-voltage testing to reduce electric-shock risk and contain sparks. The unit includes an intelligent detection system that halts testing if a plug is loose or improperly seated, preventing arcing, shorts, and potential device damage.

• Clear safety cover that locks during live testing for operator protection.
• Automatic stop when poor contact or improper insertion is detected.
• Robust housing and secure plug sockets for repeatable professional use.

How easy is it to read and control the tester?

A bright digital display shows the exact RPM setting while simple “+” and “–” buttons let you adjust frequency precisely. The intuitive controls and immediate visual feedback reduce guesswork so you can diagnose ignition issues faster, even in busy shop environments.

• Digital readout for precise RPM/frequency values.
• Simple plus/minus controls for quick adjustments.
• Fast diagnosis workflow: set frequency, insert plugs, observe spark intensity and stability.

Who this is for: the AUTOOL SPT360 is designed for professional mechanics, service shops, motorcycle and marine technicians, and DIY enthusiasts who need a reliable, repeatable way to evaluate spark plug performance across multiple cylinders. If you routinely service gasoline engines, perform tune-ups, or need a safe bench tester to compare plug condition and ignition consistency, the SPT360 provides clear readouts, adjustable simulation, and protective safeguards that speed up diagnostics and reduce guesswork.