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AHF analysentechnik AG, Germany

AHF analysentechnik has been founded in 1981 and specializes in distribution and engineering of accessories for optical plasma emission spectrometry and sample introduction systems in ICP-MS analysis. The range of products is complemented by labware and devices for sample handling in ultra-trace ana more

Fritsch GmbH, Germany

FRITSCH is one of the internationally leading manufacturers of application-oriented laboratory instruments for sample preparation and particle sizing. Here a short view of the FRITSCH instrument ranges: - Mills for crushing, micro-milling, mixing, homogenising of hard-brittle, fibrous, elasti more

Bernd Kraft GmbH, Germany

For over 40 years, Bernd Kraft® GmbH has produced ready-to-use laboratory chemicals that are supplied in containers from 1 ml to 1,000 l. Our portfolio of more than 10,000 products ranges from standards for chemical analytics, standard solutions, buffer solutions, reagents for analytical more

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Products Standards

A Wish Come True: Ready-To-Use Solutions, Reagents, Salts and Standards

As a specialist for ready-to-use reagents, salts and standards for chemical analyses in the laboratory, Bernd Kraft® maintains more than 10,000 research laboratory chemicals in its portfolio more

Certified Reference Materials for Instrument Performance Verification

Verify your Spectrophotometer using Starna Certified Reference Materials – trusted by end-users worldwide for their excellent quality and reliability more

Create Your Own Calibration Gas Standards

At a constant temperature, the device emits the compound through its permeable portion at a constant rate more

Catalogs Standards

The New Catalogue with over 10,000 Ready-To-Use Laboratory Chemicals

This handy Bernd Kraft catalogue probably contains the most extensive range of ready-to-use mixtures, standards and tailor-made solutions in Europe more

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White papers Standards

Publications Standards

  • Random number generators go public

    On 10 July, researchers in Chile will unveil an online public random number service. Later in July, the U.S. National Institute of Standards and Technology (NIST) will launch its Randomness Beacon as a permanent service, upgrading a pilot program that began in 2013. Brazil, too, is planning a beacon more

  • Prevalence-induced concept change in human judgment

    Do we think that a problem persists even when it has become less frequent? Levari et al. show experimentally that when the “signal” a person is searching for becomes rare, the person naturally responds by broadening his or her definition of the signal—and therefore continues to find it even when it more

  • Toward a sustainable materials system

    Global annual resource use reached nearly 90 billion metric tons in 2017 and may more than double by 2050. This growth is coupled with a shift of materials extraction from Europe and North America to Asia. In 2017, 60% of all materials were extracted in Asia, and extraction is expected to rise subst more

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Authors Standards

  • Dr. Klaus Fritsch

    Klaus Fritsch is Manager Compliance of the Global Business Area “Laboratory Weighing” within Mettler-Toledo. He has been with Mettler-Toledo since 2005, acting as senior metrologist and consulting the industry to achieve compliance with applicable regulations when using weighing instruments. He rece more

Definition

Caesium standard

Caesium standard A caesium standard is a primary frequency standard in which electronic transition s between the two hyperfine ground state s of caesium-133 atom s are used to control the output frequency. By the definition of the SI second ... more

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