Uploaded December 2024 | Updated September 2026, 1 week ago
Designed to measure the pH and chlorine concentration of drinking water, the Hellige-type comparator works by comparing the colour of a water sample treated with a suitable indicator (bromothymol blue or tolidine) with a rotating disk of standard colour references.
Chemical Weapon Detection Kits Videos:
youtu.be/DViWRTxz6PQ
youtu.be/P0D4Ph_yRYM
youtu.be/tAgXfVXcVRM
SOURCES
patents.google.com/patent/US2167060A/en?q=(colour)&assignee=hellige&oq=hellige+colour
patents.google.com/patent/US2247008A/en?q=(colour)&assignee=hellige&oq=hellige+colour
canada.ca/en/health-canada/services/publications/healthy-living/guidelines-canadian-drinking-water-quality-guideline-technical-document-ph.html
gov.nl.ca/ecc/files/waterres-training-adww-2016-07-brenna-farmer.pdf
safewater.org/fact-sheets-1/2017/1/23/what-is-chlorination#:~:text=A pH between 6.5 and,pH is preferred for disinfection.
mycompanies.fandom.com/wiki/Wallace_&_Tiernan_Company
etsy.com/ca/listing/1010821818/vintage-gadget-tool-hellige-comparator
https://aquaanalytic.ae/brendy/wallace-tiernan/
https://cdn.who.int/media/docs/default-source/wash-documents/wash-chemicals/ph.pdf?sfvrsn=16b10656_4#:~:text=In water with a buffering,higher pH in limestone areas.
gracesguide.co.uk/Wallace_and_Tiernan
ebay.com/itm/174267049109
Designed to measure the pH and chlorine concentration of drinking water, the Hellige-type comparator works by comparing the colour of a water sample treated with a suitable indicator (bromothymol blue or tolidine) with a rotating disk of standard colour references.
Chemical Weapon Detection Kits Videos:
youtu.be/DViWRTxz6PQ
youtu.be/P0D4Ph_yRYM
youtu.be/tAgXfVXcVRM
SOURCES
patents.google.com/patent/US2167060A/en?q=(colour)&assignee=hellige&oq=hellige+colour
patents.google.com/patent/US2247008A/en?q=(colour)&assignee=hellige&oq=hellige+colour
canada.ca/en/health-canada/services/publications/healthy-living/guidelines-canadian-drinking-water-quality-guideline-technical-document-ph.html
gov.nl.ca/ecc/files/waterres-training-adww-2016-07-brenna-farmer.pdf
safewater.org/fact-sheets-1/2017/1/23/what-is-chlorination#:~:text=A pH between 6.5 and,pH is preferred for disinfection.
mycompanies.fandom.com/wiki/Wallace_&_Tiernan_Company
etsy.com/ca/listing/1010821818/vintage-gadget-tool-hellige-comparator
https://aquaanalytic.ae/brendy/wallace-tiernan/
https://cdn.who.int/media/docs/default-source/wash-documents/wash-chemicals/ph.pdf?sfvrsn=16b10656_4#:~:text=In water with a buffering,higher pH in limestone areas.
gracesguide.co.uk/Wallace_and_Tiernan
ebay.com/itm/174267049109
