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Sapphire substrates are pure compounds without pores
Manufactured by fusing naturally occurring crystalline silica
Use these replacement pens with Oakton™ Economy Hygrothermographs.
Rainfall Sprinkler Measure with 100 mm diameter rain gauge.
Brannan™ Classroom Wall Thermometer Kit includes a large, colorful, plastic wall thermometer and chart for recording temperatures.
Brannan™ Thermometer Science Kit comes in a blue plastic case and includes a variety of instruments and a set of investigative science notes.
Comprehensive collection of 30 fossils.