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Titration allows students to apply scientific concepts to discover what a titration is, how it is performed and how to determine when it is complete. Students see how this technique is applied in a number of real-world settings and become actively engaged in an experiment by using a scientific approach to determine the amount of vitamin C in a number of foods. Viewers learn about proper safety procedures as they watch a group of high school students gather, organize and present their data. Part of the multivolume Science Lab Investigations! DVD Series. Includes a Teacher's Guide.

From the highest mountains to the deepest chasms, Earth's terrain is comprised of varying levels and unique features. In Topography, students will learn how the features of Earth's surface are arranged while exploring the art and science of re-creating these terrains on maps. See how forces like earthquakes, volcanoes, water and wind have changed Earth's surface over countless centuries, and learn why studying these changes is important to learning about our planet's past and future. See how cartographers map the floor of the oceans, while an informative demonstration shows students how they can make a simple topographic map of their own. Part of the Earth Science in Action DVD Series. A Teacher's Guide is included and available online. 23 minutes. Grades 5 to 8.

• Helps to mark a safe distance between guests
• Allows a business to be in compliance with government social distancing guidelines
• High visibility fluorescent green
• UV Protect for indoor/outdoor use
• 34% more viewing space compared to 4-sided signs

Schools, retail and industrial facilities need portable signage to provide visibility and awareness related to current concerns. These 3 Sided Safety Sign cones are essential for keeping everyone safe and informed.

Comes with wooden box with foam lining. Each tuning fork has a specific place in the foam lining die-cut for easy storage. Each set also contains a mallet specially designed with one hard and one soft end, for use with all frequencies of forks. Tuning Fork set of 8. With mallet. In wooden box. Contains one each of 256, 288, 320, 341.3, 384, 426.6, 480, and 512
Comes with wooden box with foam lining. Each tuning fork has a specific place in the foam lining die-cut for easy storage. Each set also contains a mallet specially designed with one hard and one soft end, for use with all frequencies of forks. Tuning Fork set of 8. With mallet. In wooden box. Contains one each of 256, 288, 320, 341.3, 384, 426.6, 480, and 512

Approved by the Federal Highway Administration (FHWA) and The American Association of State Highway and Transportation Officials (AASHTO). They comply with the mechanical requirements for grade 60 steel of ASTM A499 and the chemical requirements for grade 1080 steel of ASTM A576. Features a ribbed back and flange for extra strength. Manufactured from the finest high-carbon new billet steel (grade SP-80), which is more reliable than conventional posts made of old rail steel. Available in 3 lengths.

• Durable vinyl coated mesh
• Reflective Panels on front and back
• Lime 1 3/8” Prismatic Reflective, located above and below the panels 
• SAFETY PATROL printed on Front and Back
• 2 Reflective panels

Easy to put on with its over-the-head poncho styling, this vest has an identical design on front and back. It has more than 129 sq. inches of Reflexite Prismatic tape, including two panels on each side with printed legend SAFETY PATROL. Vest has 1" wide elastic straps on each side.

• Front and back of the vest is 18 inches across from side to side
• 12 inch belts on each side for adjustability
• Measures 40 inches or 48 inches from bottom hem on the front across the shoulders to bottom hem on the back

Graduated Interval: 25ml These bottles are made of translucent and unbreakable low density polyethylene. The distinguishing feature that these bottles contain is the built-in delivery tube making it a one-piece wash bottle. These bottles are graduated on the outer surface to reflect an approximate volume of solution filled or dispensed.

A sensational collection that reveals the varied geological specimens found in the United States. Collection includes specimens from each of the 50 States. The rock, mineral or fossil selected to represent that state is individually "keyed" for identification. The key also includes a useful fact and a geologic feature for each individual state. Specimen size 1" x 1" x 1". Grades 3-12. Ages 8-18.
A sensational collection that reveals the varied geological specimens found in the United States. Collection includes specimens from each of the 50 States. The rock, mineral or fossil selected to represent that state is individually "keyed" for identification. The key also includes a useful fact and a geologic feature for each individual state. Specimen size 1" x 1" x 1". Grades 3-12. Ages 8-18.

• Personal Protective Equipment
• Eye Protection
• Bouton Goggles

Soft vinyl frame with 184 perforations for maximum ventilation. Optical quality, distortion free lenses. Adjustable elastic band. Easily fits over glasses. One size fits all.

Volcanoes are one of Earth's most fascinating and destructive forces. In Volcanoes, students will get an up-close look at these fiery formations, discovering how they form and what causes them to erupt. Learn the difference between magma and lava, and discover the characteristics that enable volcanologists to classify a volcano as cinder cone, shield or composite. Examine the anatomy of an active volcano, and learn about historical eruptions that have left a mark on our planet. A fun, hands-on investigation demonstrates how a tilt meter is used to predict when a volcano might erupt by charting changes in the slope of the surrounding ground, while a visit to Horseshoe Lake at Mammoth Mountain, California, highlights an invisible sign of volcanic activity -- poisonous carbon dioxide fumes. Part of the Earth Science in Action DVD Series. A teacher's guide is available online. 23 minutes. Grades 5 to 8.

• Economical solution for closing off areas for cleaning or when safety is a concern
• Wall mounts don't use floor space and are great for keeping unwanted traffic out
• Braking system and locking button to prevent accidental belt release
• Installation is simple and steel construction is durable for years of heavy use
• Span small or large openings with two different belt lengths – 8-foot or 13-foot

Quickly close off areas with these Wall Mounts with Retractable Belt. Wall mounts are the economical solution for crowd control because they do not take up floor space and are perfect for keeping unwanted traffic out. The retractable belt can span small or large openings with two different belt lengths. Installation is simple and the mount's steel construction is incredibly durable for years of heavy use. The wall mount includes safety features such as a belt braking system for slow and predictable belt return, and a locking button to prevent accidental belt release. Made in the USA. Available in two lengths and 3 styles.

These snug fitting black rubber bases are made from recycled materials Bases are interchangeable with the Navicade™ or 42" Watchtower Stacker Cones. Available in 3 weight levels.

Water is vital to all life on Earth and covers nearly three-fourths of our planet's surface. Where does it come from? Will we use it up eventually? In The Water Cycle, students learn that Earth has the same water supply today as it did millions of years ago. Examine the amazing process by which water is continually recycled and transported from place to place through evaporation, condensation and precipitation. Also find out how energy from the sun drives the water cycle and how the atmosphere prevents water from slipping away from Earth. A fun, hands-on investigation demonstrates how an artesian well works, while a visit to a desalination plant showcases how salt water is purified. Part of the Earth Science in Action DVD Series. A Teacher's Guide is included and available online. 23 minutes. Grades 5 to 8.

Ideal field test kit for performing 4 important experiments on water pollution. Test water samples for dissolved oxygen content, chlorides, phosphates, and water hardness. This kit provides all the apparatus and materials necessary for performing each test several times. Comes complete with instruction booklet.

Create a weather station right in your classroom with these durable meteorological instruments. Students can measure and record barometric pressure, relative humidity and air temperature and record the trends, averages and highs and lows. The sturdy carrying case holds a 3" barometer, as well as three stands for using the instruments individually. An activity guide explains in detail how to use each instrument. Grades K-4.
Create a weather station right in your classroom with these durable meteorological instruments. Students can measure and record barometric pressure, relative humidity and air temperature and record the trends, averages and highs and lows. The sturdy carrying case holds a 3" barometer, as well as three stands for using the instruments individually. An activity guide explains in detail how to use each instrument. Grades K-4.

The rocks and soil that make up Earth's surface are constantly being affected by a variety of forces, ranging from heat and frost to water and wind. In Weathering and Erosion, students will discover the natural forces that cause weathering, erosion and deposition, and see the many effects that these processes have on Earth's surface. Students will examine natural structures around the world and see how weathering and erosion have affected them, while discovering ways in which people have become better prepared to battle these forces through conservation. In addition, a fun, hands-on experiment demonstrates how running water erodes different types of soil. Part of the Earth Science in Action DVD Series. A Teacher's Guide is included and available online. 23 minutes. Grades 5 to 8.

This chart has illustrations and actual specimens for students to consult as they identify unlabeled rock specimens. For grades 6-12. 23 1/2" x 15 1/5".

For use with 12046 What Rock Is It? classroom project.

These polypropylene bottles are rigid, translucent and have excellent contact clarity. These bottles can be autoclaved filled as well as empty. The polypropylene cap has a built-in seal ring to make these bottles leak proof. 

This program explores the mechanics of measuring wind speed and direction as well as the use of wind as an energy source. Students will also learn how wind occurs by finding out about the roles of temperature, air pressure and the sun. Graphics and animation will clearly illustrate these patterns. Students will also learn how hot-air balloons work in this exciting look at weather's invisible force. One of six volumes in the Weather Fundamentals DVD Series in the Schlessinger Science Library. Part of the Schlessinger Science Library in Action Collection. This title correlates to the National Science Education Standards for Earth and Space Science -- structure of Earth's system, Earth's history and Earth in the solar system. A Teacher's Guide is included and available online that features additional information on the topic, vocabulary words, discussion questions, follow-up activities and lists of recommended books & Internet resources. 23 minutes. Grades 4 to 7.

Full-color molded plastic relief map. Correlate landforms with political boundaries, cities, agricultural developments. Includes time zones, scales and color keys to terrain, vegetation and ocean features. Keys to populations of major cities, national capitals, major ocean depths, and Antarctic expedition bases. 36" x 20".

The perfect way to alert the public to hazards that are located in unlit or dimly lit areas. This highly visible tape comes with a liner.

Meets American National Standard Institute ANSI Z87.1-1998.
These safety goggles have a soft flexible PVC frame that comfortably contours around your eyes with wide polycarbonate lens. Indirectly ventilated, these goggles are recommended to prevent chemical splash and ventilated for frontal impact resistance of particles. (Does not protect against UV radiation). Meets the American National Standards Institution (ANSI Z87.1).

Zinc metal, foil 0.010" x 12" x 36", (1 piece = 500g) - 500g
Zinc metal, foil 0.010" x 12" x 36", (1 piece = 500g) - 500g