• Works with 2 and 3 blade propellers (for 4 blade, just use the 2 blade setting and then divide by two.
• Easy operation
• MUST be used in sunlight.

Our tachometer uses proven technology and has been a staple in our tote box for decades. KNOW what your engine is doing. See real peak rpm. When people say tune it on the ground to 200rpm rich of peak", you can verify you've really set it that way. It is essential when tuning SH Gas engines. Uses a standard, affordable, 9v battery. (Included).

Remember, for safety, ALWAYS measure from BEHIND the spinning propeller. Safety is up to the user.