Nice color blindness book with nice illustrations for testing and demonstrating color blindness. Both numbers and figures appear in the book.
Text in both Chinese and English.
Allows students to explore the rate of water movement and quantify pressure changes occurring in the system.
Measures the water content of soil and reports it in percent. For use with PASPORT Interfaces.
Vials contain a vacuum sealed color forming reagent to test a variety of water quality parameters. 30 individual Phosphate test vials.
Designed to be placed in air or water flow. When connected to the General Flow Sensor, aids in measuring pressure differences.
Clear PVC Venturi Tube with a constriction and two pressure ports with tubing attached, for use in a pipe network.
