DT-2234C+ Digital Tachometer,
a non-contact laser photo tachometer used to measure rotational speed.
Here's information for shopping:
Non-Contact Measurement:
It uses a laser to measure RPM without physical contact, making it suitable for various applications like motors, fans, and washing machines.
Wide Test Range:
The device can measure rotational speeds from 2.5 to 99999 RPM (revolutions per minute).