Kisstaker Aquarium Tank Glass Fish Feeding Feeder Snail Trap Planarian Leech Catch Shape With Seam /Hole Process: The production using professional molds for watering, a whole molding, to avoid manual errors arising in the process, good product sealing Design: The bubble contains a very thin tube, inlet the water, through the small tube of carbon dioxide will produce bubbles, observed the amount of carbon dioxide through the bubble, can well understand and control photosynthesis of plants and animals in the tank Feature: Designed for fish tank, simple and lightweight. Function: Bubble counter is indispensable with any CO2 setup system because it helps to count the amount of Co2 injected. Material: made of crystal glass, acid and alkali, free from corrosion, high transparency, adding one landscape for the grass box