Earth Science > Environmental Science

	Secchi Disc Check the turbidity (sediment or suspended particles) of streams and rivers with this simple device by lowering the disc in water until the pattern is no longer distinguishable.
	Air Sampler Discover and measure what is in the air you breathe! Particulate matter is deposited on a high efficiency filter as air is drawn through it at a calibrated volumetric flow rate.
	Environmental Monitoring Test Kit Easily monitor six important water parameters: acidity, alkalinity, carbon dioxide, dissolved oxygen, hardness, and pH. Conduct over 100 tests of each parameter. Includes step-by-step instructions and a hard-shell carrying case.
	Water Sampler Economic water sampler collects a 1.5 liter sample from any depth. Single-cord design eliminates tangles.
	Acid Rain: The Invisible Threat Videolab Measure the pH of water samples, investigate effects of rain on plants and soils, create acid rain posters, chart the path of acid rain from source to deposition, and estimate the contribution of automobiles to the acid rain problem.
	Agriculture Test Kits Monitor key macronutrient and pH levels in your soil. Ideal for home horticulture and gardening. Test nitrogen, phosphorus, potassium and pH levels in trace, low, medium and high ranges.
	Screen Sieves Kit Separate and grade dry soil samples into five different size ranges from pebbles to silt. Set includes one cover, one solid bottom container, and stacking containers with #6, #20, #40, and #100 wire mesh screens.
	Natural Energy Kit This kit contains 19 hands-on activities which explore electric, wind, solar, geothermal, biomass and nuclear energy.