This viewer is perfect for groups studying aquatic plant and animal life. Look down the 26” tube - you’ll encounter no surface glare or internal reflection. The Aquaview may also be used with a Secchi disk. The design results in more accurate turbidity readings - you eliminate the errors that could crop up depending upon weather factors, different observers, different angles or different times of day. This apparatus is constructed of crush-resistant tubing and features a black interior, flotation collar, neoprene viewing mask and easy-to-use handle. Ship wt: 1.75 lbs.