Qualifies for Discounts

These polypropylene bottles are rigid, translucent and have excellent contact clarity. These bottles can be autoclaved filled as well when they are empty. The polypropylene cap has a built-in seal ring to make these bottles leak proof. Avaialble in 5 sizes.

Size	Height	Neck Diameter ID/OD	Pack Size
60ml	72mm	17mm / 22mm	Pack of 12
125ml	110mm	16.5mm / 20mm	Pack of 12
250ml	139mm	20mm / 25mm	Pack of 12
500ml	165mm	20mm / 25mm	Pack of 12
1000ml	222mm	20mm / 25mm	Pack of 6

Four-function, dual-powered calculator fits on the overhead to teach basic math operations, percents and square roots to an entire class. Includes auto shut-off, three-key memory and more. Measures 4 1/4" x 6 1/8" Grades PreK +
Four-function, dual-powered calculator fits on the overhead to teach basic math operations, percents and square roots to an entire class. Includes auto shut-off, three-key memory and more. Measures 4 1/4" x 6 1/8" Grades PreK +

These calculators can start with basic math operations and work their way up to more advanced concepts such as percents and square roots. This dual-powered, four-function calculator includes auto shut-off, 3-key memory and more. Measures 4 1/2" x 2 1/2" Grades Pre K +
These calculators can start with basic math operations and work their way up to more advanced concepts such as percents and square roots. This dual-powered, four-function calculator includes auto shut-off, 3-key memory and more. Measures 4 1/2" x 2 1/2" Grades Pre K +

• Dual Scale
• Hecto Pascal (hPa)
• Millimeter Mercury (mmHg)
• 4" Dial
• 5 YR Warranty

Dial Barometer for Classroom, Lab, Industrial Use. Large, clear dual-scale barometer in hPa (hecto Pascal) and mm (millimeter mercury) on a 4" dial which is easy to read from a distance. For classroom, lab, or industrial use. Accuracy of ±3 to 4 hPa. Wall mounts. Weight: 2.6 oz.

For classroom, lab, or industrial use. Large, clear 20-100% RH scale on 4" dial. Easily read from a distance. Uses a precise synthetic hair hygrometer with an accuracy of Ò5%. Plastic face meets food industry requirements. Inner dial shows temperature using a bimetal thermometer, with an accuracy of Ò2ßF. Wall mounts
For classroom, lab, or industrial use. Large, clear 20-100 percent RH scale on 4 inch dial. Easily read from a distance. Uses a precise synthetic hair hygrometer with an accuracy of ±5%. Plastic face meets food industry requirements. Inner dial shows temperature using a bimetal thermometer, with an accuracy of ±2 degrees F. Wall mounts

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.

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".

• Eyepieces - 10X
• Objectives - Zoom
• Magnification - 20X to 100X
• Illumination - Mirror
• Mirror adjustment knob
• Sturdy plastic construction
• Tamper resistant viewing tube
• Shock resistant stand
• Achromatic ground and polished glass lenses

Permanently attached reversible mirror, concave on one side while surface on the other to direct natural light onto the specimen. Rotating the optical tube brings specimen into focus. Zoom range from 25x to 100x by moving the eyepiece tube up or down. Size and Weight - 4" x 5" x 7.5", 1 lb. Warranty-5 Years

Eyepieces - 10X Objectives - Zoom Magnification - 20X to 100X Illumination - Mirror. Mirror adjustment knob. Sturdy plastic construction. Tamper resistant viewing tube. Shock resistant stand. Achromatic ground and polished glass lenses. Permanently attached reversible mirror, concave on one side while surface on the other to direct natural light onto the specimen. Rotating the optical tube brings specimen into focus. Zoom range from 25x to 100x by moving the eyepiece tube up or down. Size and Weight - 4" x 5" x 7.5", 1 lb. Warranty-5 Years

A great economical model to teach dental hygine and demonstrate the correct way to brush teeth and gums. Large lower and upper jaws, 6" wide on the back, 5" long. The two jaws are connected by bendable spring wires for easy demonstration. The model is 17" long, when it is completely laid flat. Included a 10" long tooth brush with nylon bristles.
A great economical model to teach dental hygine and demonstrate the correct way to brush teeth and gums. Large lower and upper jaws, 6" wide on the back, 5" long. The two jaws are connected by bendable spring wires for easy demonstration. The model is 17" long, when it is completely laid flat. Included a 10" long tooth brush with nylon bristles.

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.

Rock and Rock-Forming Mineral Collection 24 specimens, 1-1/4", including six each of the following: rock-forming minerals, igneous, sedimentary and metamorphic rocks. Also includes a Study Guide. Grades 5-12. Ages 10-18.

Included in this collection are rocks and minerals that break down to become the major components for soils. Samples of actual soils demonstrating texture and composition as end products are included. 15 specimens, 1" x 1/2", number-coded in a compartmented container. Soils packaged in plastic bags. Grades 5-12. Ages 10-18.
Included in this collection are rocks and minerals that break down to become the major components for soils. Samples of actual soils demonstrating texture and composition as end products are included. 15 specimens, 1" x 1/2", number-coded in a compartmented container. Soils packaged in plastic bags. Grades 5-12. Ages 10-18.

The term "ore" is used in connection with a rock or mineral mass when it contains enough of an element or compound to make it economically feasible to mine. 15 specimens of the more important ores are included. Grades 6-12. Ages 11-18.
The term "ore" is used in connection with a rock or mineral mass when it contains enough of an element or compound to make it economically feasible to mine. 15 specimens of the more important ores are included. Grades 6-12. Ages 11-18.

This completely revised multi-color chart depicts the entire geologic time scale with most current geologic dating information. Representative fossils from the corresponding geologic periods are mounted on the chart. New larger chart size, 18" x 24" and comes with a wood frame. Grades 6-12. Ages 11-18.

Fascinate your students with the study of fossils. Kit contains 5 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.

How does a glacier work? This model will give students the opportunity to observe the effects of glacial movement without having to endure glacial time. First model depicts a glacier in its active stage, while the second model shows post-glacial conditions. Using the second model, students can create their own glacier using ice and sand to observe glacial melting and deposition of glacial till. Each model is 18" x 24", formed in high impact plastic. Teacher's guide included. Set of 2.
How does a glacier work? This model will give students the opportunity to observe the effects of glacial movement without having to endure glacial time. First model depicts a glacier in its active stage, while the second model shows post-glacial conditions. Using the second model, students can create their own glacier using ice and sand to observe glacial melting and deposition of glacial till. Each model is 18" x 24", formed in high impact plastic. Teacher's guide included. Set of 2.

Used to simulate effect of earth's rotation on winds, ocean currents or unattached objects such as rockets. As sphere is launched across surface of base, when it is static, sphere traces a straight line. As turntable is put in motion, centrifugal force launches the sphere which, though traveling in a straight line, leaves a curved trace on rotating surface. Size of curve is in direct ratio to speed of rotation. Each kit includes one 14" diam. base (with outer retaining trough) mounted on a turntable, and featuring a reusable "magic slate" type erasable trace recording surface, removable launcher, 5/8" diameter steel spheres.

Students explore North America's mineral and rock resources and how man uses them all. Mounted natural specimens and corresponding man made products (i.e. gypsum and wallboard, bauxite and aluminum) are placed on a map of North America. 18"x24" in wood frame. Grades 6-12.

The relationship between resources that are renewable in one human life span and the associated products are clearly illustrated on this visually appealing chart. Students will be enticed to investigate the worldwide resources for materials they use every day. This chart complements the Investigating Non-Resources chart. Representative natural materials and the corresponding everyday products are mounted on a sturdy, wood framed 18"x 24" image. Grades 6-12.

Wood framed reference chart, complete with mounted specimens. The evidence supporting the theory of Plate Tectonics is shown on this chart. Rock specimens that illustrate the variety of processes related to the Earth's dynamic crust are mounted on this 18" X 24" chart. Grades: 4 - 12.

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.

Find out what pollutes drinking water and how it can be made safe again following pollution. Conduct experiments on the chemicals and organisms that make water unsafe to drink and conduct an experiment on its purification. Learn the causes and effects of water pollution.

Zinc sulfate, lab grade, granular is commonly used in classroom settings for chemistry experiments and to illustrate various scientific concepts due to its solubility and reactivity. Some of the typical applications include:

1. Precipitation Reactions: Zinc sulfate is used to demonstrate precipitation reactions when mixed with other compounds. For example, when combined with sodium carbonate, it forms zinc carbonate, a white precipitate. This can be used to illustrate the principles of solubility, ionic reactions, and compound formation.

2. Galvanic Cells and Electrochemistry: Zinc sulfate is frequently used in electrochemical cells (such as Daniell cells) to study the behavior of zinc as an electrode and to teach concepts of oxidation and reduction, electrode potentials, and electron flow in galvanic cells.

3. Testing for Anions: It can be used as a reagent in testing for the presence of specific anions in solutions. For instance, in analytical chemistry, zinc sulfate might be utilized in qualitative tests to help identify sulfide ions through the formation of a white precipitate (zinc sulfide).

4. Growth Medium for Biological Studies: In biology and environmental science classes, zinc sulfate is sometimes used as a trace element in preparing growth media for certain plants or algae to study the effects of zinc on growth and development.

5. Illustrating Properties of Transition Metals: Zinc is often grouped with other transition metals to compare chemical properties, such as reactivity with acids and the formation of complex ions in solution.

Safety precautions should be observed when handling zinc sulfate, as it can be harmful if ingested or inhaled in powder form. Proper protective equipment, such as gloves and safety goggles, is recommended during use.

Cupric sulfate (copper(II) sulfate) reagent fine crystals are widely used in classrooms for chemistry experiments and demonstrations, primarily due to their distinct blue color and diverse chemical properties. Common educational uses include:

1. Chemical Reactions and Color Changes: Cupric sulfate is often used in experiments to demonstrate various chemical reactions, such as double displacement reactions and redox reactions. For example, when zinc metal is placed in a solution of cupric sulfate, a redox reaction occurs, producing copper metal and zinc sulfate.

2. Electrolysis and Electroplating: Cupric sulfate is commonly used in electrochemistry experiments to demonstrate the principles of electrolysis. Students can use it to deposit a layer of copper on a metal object, illustrating the concept of metal plating.

3. Crystallization and Hydration Studies: Cupric sulfate crystals are ideal for studying crystallization and hydration. In its hydrated form (CuSO₄•5H₂O), it is a vibrant blue, but it turns white upon heating when it loses its water molecules. This change is used to teach about the effects of hydration and dehydration on compounds.

4. Identifying Presence of Water: Cupric sulfate can also be used as a qualitative test for water. The blue hydrated form turns white when heated (as it becomes anhydrous), and when a drop of water is added to the anhydrous form, it turns blue again. This makes it an excellent tool for illustrating reversible hydration reactions.

5. Demonstrating Copper Ion Properties: The distinct blue color of cupric sulfate is due to the presence of copper(II) ions in solution. It is often used to teach students about the behavior of transition metals and their unique colors in aqueous solutions.

Cupric sulfate should be handled carefully, as it is toxic if ingested and can cause irritation to skin and eyes. Proper safety equipment, including gloves and goggles, should be used during experiments.