Check the listing for details. Seachem Laboratories Glass Bubble Counter Pollen 17mm Diameter. Condition: New. Listed at 12.95 USD. This Seachem Laboratories Glass Bubble Counter Pollen has a diameter of 17mm, making it an ideal choice for those in need of a bubble counter. It is manufactured in the United States and is suitable for use in CO2 equipment, aquariums, and pet supplies. The model is Bubble Counter, and it is made by the well-known brand Seachem. With its high-quality glass construction, this bubble counter is built to last and is an essential tool for any aquarium enthusiast. It is easy to use, and its compact size makes it perfect for use in small tanks. Whether you are a beginner or an experienced aquarium keeper, this Seachem bubble counter is a must-have for anyone looking to keep their tank healthy and thriving. New in Box!! See photos!! Fast free shipping!