"water bath"

With water temperature being such a critical factor for the well-being of fish, it's important to have a good thermometer. This Marina Standing Thermometer is designed to sink to the bottom of the aquarium and remain in a vertical position.

This three-in-one meter allows you, at the flick of a switch, to check soil pH, find out how much light a plant is receiving, and check to make sure your plants have enough water.

A compact external filter. Fluval 306 Canister Filter delivers many practical benefits-including better filtration, less maintenance frequency, faster setup, and quieter operation-all designed to make fishkeeping more enjoyable. Building on the success of Fluval 05 Series filters, this filter provides enhanced functionality and filtration performance to create the cleanest, healthiest aquariums ever.

More bubbles are more fun.

Unlike traditional pendulums, the Kater's pendulum center of gravity does not have to be know in order to determine the acceleration due to gravity.

Alkaline lantern batteries with screw terminals of size 6 V block.

Classical demonstration of refraction and internal reflection.

Do you have a contraption to power? Here is a simple solution.

Improve Your biOrb® Aquaria.

Efficiently illustrates the various types of diffraction.

The laser pointer holder can be used on a magnetic blackboard or on a table top.

Waterproof Unit Is Completely Safe, Even When Wet

Radiant heat without light.

Excellent filtration inside the tank!

A simple and effective filter.

The 2-ply Boot foot Hipper is a rugged and classic poly rubber hip boot design.