9x12 Inch Dry Erase Boards, Classroom Whiteboard for Students, Double Sided, Set of 10 Compatible with Optional Probes: Supports

Compatible with Optional Probes: Supports chlorine and ORP modules (sold separately) for expanded functionality

Anatomically Correct: Developed by medical professionals

Output accuracy: Voltage: 0

power adapter (output of AC100V-240V and DC12V

Each of the large Aluminum Alloy tuning forks is hand ground to high accuracy and has a frequency of 440 Hz (hertz=cycles / second)

9x12 Inch Dry Erase Boards, Classroom Whiteboard for Students, Double Sided, Set of 10 Compatible with Optional Probes: SupportsPerfect for Classrooms. Dry Erase for Easy Cleaning. Slim Design & Reusalbe. Premium Quality: This item is made of high quality, heavy duty and durable materials. Designed for use in classrooms, household and educational settings. If you need custom order with different sizes design, please contact us. Safely Packaged to avoid being damaged during transportation.