ZOMEi 52mm Slim HD 18 Layer Super Multi-Coated SCHOTT Glass PRO Fader Neutral Density Adjustable Variable Filter (ND2 to ND400)

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Backed with a PLR 100% Satisfaction Guarantee. PLR filters continue the brand’s long legacy of superior optical solutions. All our filters are carefully formulated to ensure consistent color and accuracy throughout the entire surface of the glass. Why? Consistent color means consistent high quality results. We know that a poorly made filter makes a great lens and camera worthless, that’s why the our frame rings are constructed of special alloys that won’t expand or contract over time or due to temperature extremes-it’s also why we back our filters with an 10 year warranty-because we engineer them to last. Like all PLR optics, PLR filters are precision manufactured to the most demanding of tolerances. This ensures consistent high quality results even after years of use.

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H-B DURAC B61894-0100 Soil Analysis ASTM 152H Hydrometer; Traceable to NIST, Range: -5/60g/L, Length: 280mm (11″)

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These hydrometers are used to determine the specific gravity of soil in the range of 0.995 to 1.038, or -5 to 60 g/L (using a weight by volume scale). Made of lead free ballast and glass, these 280mm (11”) long hydrometers conform to the accuracy requirements of ASTM hydrometers. Each is individually serialized and has a temperature standardization of 68 degrees F/68 degrees F. DURAC Soil Analysis ASTM Hydrometers are hand inspected by our U.S. quality team in our exclusive triple accredited/registered ISO/IEC 17025:2005 and A2LA Accredited Calibration Laboratory; internationally recognized and accepted by the signatory economies of the ILAC /MRA and located in our ISO 14001:2004 Environmental Management System registered facility. They are packaged with a multi-language (English, French, German, Italian, Portuguese, and Spanish) Statement of Accuracy indicating accuracy traceable to NIST. Note: Soil analysis hydrometers should be stored in a clean, dry, safe place, and should not be subjected to extreme temperatures.

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Key Concepts in Environmental Chemistry

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Key Concepts in Environmental Chemistry provides a modern and concise introduction to environmental chemistry principles and the dynamic nature of environmental systems. It offers an intense, one-semester examination of selected concepts encountered in this field of study and provides integrated tools in explaining complex chemical problems of environmental importance. Principles typically covered in more comprehensive textbooks are well integrated into general chapter topics and application areas. The goal of this textbook is to provide students with a valuable resource for learning the basic concepts of environmental chemistry from an easy to follow, condensed, application and inquiry-based perspective. Additional statistical, sampling, modeling and data analysis concepts and exercises will be introduced for greater understanding of the underlying processes of complex environmental systems and fundamental chemical principles. Each chapter will have problem-oriented exercises (with examples throughout the body of the chapter) that stress the important concepts covered and research applications/case studies from experts in the field. Research applications will be directly tied to theoretical concepts covered in the chapter. Overall, this text provides a condensed and integrated tool for student learning and covers key concepts in the rapidly developing field of environmental chemistry.

  • Intense, one-semester approach to learning
  • Application-based approach to learning theoretical concepts
  • In depth analysis of field-based and in situ analytical techniques
  • Introduction to environmental modeling
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