CASIO F91 is a popular watch series of Casio. Although It's launched 35 years ago, still peole like It.
Extreme Experiment with CASIO F91 Watch
1. Water Test
2. Mud Test
3. Cold Test
4. Heat Test
ফেসবুক: https://www.facebook.com/zeroideaScie...
ZERO IDEA Youtube Channel is based on Science Experiments.Thank You.