This three dimensional model of the sun and planets teaches planet identification, sizes, distance and color. The planets may be set by month to show relative positions. A sturdy base supports the 6" diameter sun with the outer planet 18" from the sun. Illustrated Study Guide includes position table. Lesson Plan facilitates explanation of orbit and speed. 12" x 22" x 8".
Consists of a large "U" shape tube 50 cm in length, with both ends long enough to connect to rubber tubing, mounted on a sturdy wooden base. Large enough for classroom demonstration. Entire unit mounted on heavy metal base.
Consists of a large "U" shape tube 50 cm in length, with both ends long enough to connect to rubber tubing, mounted on a sturdy wooden base. Large enough for classroom demonstration. Entire unit mounted on heavy metal base.
Proper dissolved oxygen levels are essential for aquatic ecosystems. A dissolved oxygen level of 5 mg/L or greater will support healthy growth of most fish species. Other applications include monitoring in waste water treatment plants, determination of BOD and COD. This test kit uses an adaptation of the Winkler method to determine dissolved oxygen. Includes 100 tests.
Accuracy: ±0.05pH Resolution: 0.01pH The pHep 5 includes features such as a dual-level LCD, battery level indicator, replaceable pH electrode cartridge, instability indicator, automatic shut-off and automatic calibration all in a floating, waterproof casing. Supplied with protective cap, electrode removal tool, batteries and instructions.
Accuracy: ±0.05pH Resolution: 0.01pH The pHep 5 includes features such as a dual-level LCD, battery level indicator, replaceable pH electrode cartridge, instability indicator, automatic shut-off and automatic calibration all in a floating, waterproof casing. Supplied with protective cap, electrode removal tool, batteries and instructions.
Fascinate your students with the study of fossils. Kit contains 10 sets of 21 plastic reproduction fossils that students can measure, identify, and classify according to geologic era using the included fossil key. Grades 6-12.
50 specimens approximately 1-1/2". Includes industrial minerals, gem-type minerals, rock-forming minerals and igneous, sedimentary and metamorphic rocks plus Study Guide. Grades 5-12. Ages 10-18.
50 specimens approximately 1-1/2". Includes industrial minerals, gem-type minerals, rock-forming minerals and igneous, sedimentary and metamorphic rocks plus Study Guide. Grades 5-12. Ages 10-18.
45 specimens, approximately 1.5" x 1.5", includes 15 each of igneous, sedimentary and metamorphic rocks. Each category of rock is well represented and forms an integrated classroom study unit. Grades 6-12. Ages 11-18.
This collection includes examples of silicates, oxides, sulfates, phosphates and other major mineral groups as classified in Dana's Textbook of Mineralogy. 50 specimens approximately 1" x 1", number-coded in compartmented tray. Grades 6-12. Ages 11-18.
This collection includes examples of silicates, oxides, sulfates, phosphates and other major mineral groups as classified in Dana's Textbook of Mineralogy. 50 specimens approximately 1" x 1", number-coded in compartmented tray. Grades 6-12. Ages 11-18.
• STOP/GO reversible sign
• Heavy-duty 18" dia aluminum sign
• Visible from one hundred yards away
• Bold 6" high letters
• 70" High PVC tube for safe use.
• Sign is printed on both sides.
• Includes flashing red light on "STOP" side.
• Light uses 2 AA batteries (not included).
This heavy-duty 18" diameter aluminum sign is visible from one hundred yards away, has bold 6" high letters and is easily recognized by pedestrians and motorists. It is supported by a PVC tube for safe use. Sign is printed on both sides. Includes flashing red light on "STOP" side. Light uses 2 AA batteries (not included). 70" High. Ships small package.
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