Can you use this to calculate the speed of a Tennis serve

No. This measures revolutions per minute. Not speed of an object

Will it giv me the rpm of a vw beetle engine

Yes. Put a small piece of the reflective tape on the drive belt pulley near it's edge then direct the counter at the tape when the engine is running.

would this read the rotational speed of a spur or pinion gear in a high speed rc car ?

Probably not, there wouldn't be enough dead space. Trigger tape for the optical sensor is roughly 10 mm wide .

Will this measure rpm of chainsaw in order to tune it hi Dr

You can - mark the chain with the supplied reflective strip, count number of links on chain. 1 rpm will be X number of links then divide by number of teeth on engine sprocket = engine RPM.

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🚀 Measure Like a Pro, Lead Like a Boss

MEMORY RECALL MAGIC - Automatically stores last measurement for instant review anytime
CLEAR VISUAL COMMAND - Bold 18mm digits on LCD ensure quick, error-free readings
ERGONOMIC POWERHOUSE - Comfort-fit design for seamless handheld use during long tasks
VERSATILE RPM MASTER - Perfect for motors, lathes, and machine parts in wood & metalwork
PRECISION AT YOUR FINGERTIPS - Accurate RPM readings eliminate guesswork with laser photo tech

The AGPTEK Professional Digital Tachometer offers a wide RPM range from 2 to 99,999 with ultra-high 0.1 RPM resolution displayed on a large 0.7-inch 5-digit LCD. Its ergonomic design fits comfortably in hand, making it ideal for precise speed measurements of motors and machine parts in both wood and metalworking. The device automatically stores the last reading for easy recall, powered by 4 AAA batteries for reliable field use.

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Manufacturer	FITNATE
Brand	AGPTEK
Product Dimensions	12.47 x 7.01 x 2.9 cm; 160 g
Batteries	4 AAA batteries required.
Item model number	4350282862
Manufacturer part number	iT8+iT85
Item Weight	160 g

AGPtek® Professional Digital Tachometer, Non Contact Digital Laser Photo Tachometer RPM Tach

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