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Apera Instruments YD300 Portable Water Hardness (CA2+ and MG2+)


Apera Instruments YD300 Portable Water Hardness (CA2+ and MG2+)


Product description

Apera Instruments’ YD300 is designed for quick amp; accurate measurements of Water Hardness (the concentration of calcium ions Ca2+ and magnesium ions Mg2+). YD300 comes equipped with Apera's 601-S water hardness combination electrode that is proven to produce the same accuracy as the traditional EDTA Volumetric Method but in a much more convenient manner. Unlike the traditional EDTA Method, There is no need for probe stirring or adding reagents during tests, and you can directly measure your sample solutions’ ion concentration. The meter utilizes an intelligent chip design that supports automatic calibration, data storage (up to 99 groups) and a low battery voltage indicator. YD300 supports the ability to switch between eight commonly-used water hardness units, including mmol/L, mg/L (CaCO3), mg/L (CaO), mmol/L (Boiler), mg/L (Ca), ˚fH (France Degree), ˚dH (German Degree) and ˚eH (England Degree). YD300 is IP57 waterproof rated and comes as a complete kit, including YD300 meter, 601-S water hardness electrode, water hardness calibration solutions ( B1, B2 and B3 ), corresponding calibration bottles, water hardness activation solution, a 20 ml test cup, a test cup pedestal, 2 AA batteries, and a quick manual all in a rugged carrying case. Applications: drinking water, wastewater, cooling towers, boilers, pipelines, aquaculture, pools amp; spas, etc. The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.

Apera Instruments YD300 Portable Water Hardness (CA2+ and MG2+)







Bibliography Database of living/fossil sharks, rays and chimaeras

(Chondrichthyes: Elasmobranchii, Holocephali)


published by


in cooperation with

Shark-References is an online database that contains scientific bibliography on recent and fossil sharks, skates, rays and chimaeras (cartilaginous fishes, Chondrichthyes). The database started in June 2009 with a data inventory of about 1,000 scientific quotations. Since then, it has expanded continuously, and today holds more than 22,000 data inputs. At the beginning, the concept intended a scientific bibliography only, but in the meantime the provided information has also extended to other related topics.

500ml Fertilizer Nitrogen Fixing Flask Double Connecting Sphere Bibliography:
In addition to standard biographical information such as author, year of publication, title, location, DOI, abstract, the bibliography also offers keywords like  “time”, “place”, “names of species” and “synonyms”.

 List of authors:
In this list you can browse authors`names.

 Type data base:
Information on particular types of first descriptions (holotypes, paratypes, etc.) either originates from first descriptions directly or comes from the type database (Menu: Type database). This database lists all types with more than 6,200 entries and links to the collection locations of specimens. More information is provided by clicking  the info symbol. Further, species information and site of first record of more than 3,000 types are shown in a Google-map.

 Species descriptions:
The species description provides the user with all available information on a particular species. Along with first description data (as for synonyms) relevant type information is also included. The linked type data base holds more than 6,200 types entries with detailed information such as age, sex, place of first record,geographic coordinates and parasites.

Many thanks to the following authors for writing species descriptions (number of species description in brackets):
Clinton Duffy (1), Simon Weigmann (1)


 Host-Parasite List and Parasite-Host List of Elasmobranchs: 
In this two lists you will find information about parasites of Elasmobranchs 


Digital versions of first descriptions:
The menu item “bibliography – first description” contains numerous digitalized first descriptions of fossil species. Among others, historic publications are featured (e.g. Louis Agassiz, Recherches sur les poissons fossiles. Volume 3, 1843).

How you can help:
Shark-References would kindly like to ask you for your contribution to this project. Users can participate in many ways:

  • Please send us missing references.
  • Send us your publications that are not incorporated so far (which is indicated by the missing info symbol at the quotation).
  • Pictures of sharks, skates, rays and chimaeras are needed. Authors will be credited.
  • Should you notice mistakes, encounter incomplete links, or or experience any access problems, please let us know.
  • You have information for the monthly newsletter? Please send an email.
  • Subscribe to our monthly newsletter, or visit us on facebook regularly, and tell your friends.

Partner Organisations (complete list of partners):









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(Pollerspöck, J. & Straube, N. 2021, www.shark-references.com, World Wide Web electronic publication, Version 2021)

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