Doppler Ball
# 3B40.10
| Description | A battery powered speaker is inside of a foam ball. Through the ball back and forth you will hear the difference of the pitches. |
| Location | 26D |
Doppler Ball
# 3B40.10
| Description | A battery powered speaker is inside of a foam ball. Through the ball back and forth you will hear the difference of the pitches. |
| Location | 26D |