[To all users]

• Possible to emit a linear ray well-defined enough even in a classroom of normal illumination level because of the built-in high-brightness red LED and the tank with colored water inside.

[To teachers]

• Portable because dry cell battery is the power source.
• Students’ safety is secured because LED is used for the light source that is much less harmful for eyes than laser.
• Easy to manage students’ activities because experiments can be carried in a classroom of normal illumination level (with lights on).

[To students]

• Suitable for students’ experiment because of its tank size (φ90mm).
• Refraction tank is equipped with rubber magnets on the back side to be fitted on a whiteboard, therefore, students can make their own presentation using the tank on the whiteboard.
• Ray unit is on the same board of the tank, so student can tilt the tank to observe light refraction and reflection appears inside.

• Whole size: 170 × 100 × 35mm
• Tank size: φ90 × 20mm
• Material: Body-acrylic, Tank-transparent acrylic
• Magnets: 4 on the back side
• Light source: Liner LED (High brightness red color)
• Power supply: AA batteries (x2) (sold separatory)
• Accessories: Scale plates (two types, for angle x1, for refractive index x1)