"water bath"

The AquaClear Power Filters features a unique multi-stage filtration system that provides complete mechanical, chemical and biological filtration for superior water quality. The Power Filter has a filtration volume that is up to seven times larger than comparable filters. It also allows superior contact time with filter media. The filter preserves beneficial bacterial creating a stress-free environment for aquarium inhabitants and maintaining clear aquarium water.

The Variable Speed Wave Generator is a new concept for generating waves in your stream table. The paddle enters the water, forms the wave, then is withdrawn to eliminate back waves.

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.

Students use several techniques to investigate the location, methods, and mechanisms of transpiration in plants. Students first determine the source of water loss and confirm their findings with a qualitative chemical test. Then they prepare microscope slides of xylem in stem tissue, and prepare a leaf imprint using an innovative method that vividly highlights stomate structures. Finally, using WARD’S specially-designed potometer and supplied materials, students subject bean seedlings to varying environmental conditions to determine how transpiration is affected. You’ll get enough materials for eight setups, a teacher’s guide, and student copymaster.

More bubbles are more fun.

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.

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!