{"id":31586,"date":"2026-03-12T11:34:14","date_gmt":"2026-03-12T10:34:14","guid":{"rendered":"https:\/\/rls-wacon.de\/produkt\/caldur-ph-5-8-colorimetric\/"},"modified":"2026-03-12T11:34:14","modified_gmt":"2026-03-12T10:34:14","slug":"caldur-ph-5-8-colorimetric","status":"publish","type":"product","link":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/","title":{"rendered":"Caldur\u00ae pH 5-8 &#8211; Colorimetric"},"content":{"rendered":"<h2>CALDUR\u00ae pH 5-8 test set &#8211; Colorimetric<\/h2>\n<h3>What is the pH value 5-8 measured for?<\/h3>\n<p>The pH range 5-8 is the <strong>most important range for drinking water and most natural waters<\/strong>. Drinking water typically has a pH value between 6.5 and 8.5, with the optimum range being pH 7.0-7.5. <\/p>\n<p>The pH value influences numerous water treatment processes: the effectiveness of disinfectants, the solubility of metals, the efficiency of flocculants and the water&#8217;s tendency to corrode.  <strong>Even small pH changes can have a considerable effect on water quality.<\/strong><\/p>\n<p>In aquaristics, the pH value is crucial for the well-being of fish and plants. Most freshwater fish prefer a pH value between 6.5 and 7.5. <\/p>\n<h3>How does the test set work?<\/h3>\n<p>The CALDUR\u00ae pH 5-8 Test Set &#8211; Colorimetric uses a mixing indicator that takes on a characteristic color depending on the pH value of the sample. After adding a reagent to the water sample, the color is compared with the color chart provided within 1 minute. <\/p>\n<h3>Advantages of the CALDUR\u00ae test set<\/h3>\n<ul class=\"feature-list\">\n<li>Optimized for the neutral pH range 5-8\n<p style=\"text-indent: 30px; font-style: italic;\">Higher resolution than universal pH test sets in the practical range<\/p>\n<\/li>\n<li>300 provisions per set\n<p style=\"text-indent: 30px; font-style: italic;\">Very economical for continuous use<\/p>\n<\/li>\n<li>Fastest analysis in just 1 minute\n<p style=\"text-indent: 30px; font-style: italic;\">Immediate results on site<\/p>\n<\/li>\n<li>Only 1 reagent required\n<p style=\"text-indent: 30px; font-style: italic;\">Particularly quick and easy handling<\/p>\n<\/li>\n<li>Robust plastic housing with hinged lid\n<p style=\"text-indent: 30px; font-style: italic;\">Safe transportation and protection of reagents<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>CALDUR\u00ae pH 5-8 test set &#8211; Colorimetric What is the pH value 5-8 measured for? The pH range 5-8 is the most important range for drinking water and most natural waters. Drinking water typically has a pH value between 6.5 and 8.5, with the optimum range being pH 7.0-7.5. The pH value influences numerous water [&hellip;]<\/p>\n","protected":false},"featured_media":31587,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[637,749,633],"product_tag":[],"class_list":{"0":"post-31586","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-colorimetric-method","7":"product_cat-ph-en","8":"product_cat-testsets-caldur-en","10":"first","11":"instock","12":"shipping-taxable","13":"purchasable","14":"product-type-variable"},"exclude_global_add_ons":[],"addons":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>CALDUR\u00ae pH 5-8 test set - Colorimetric<\/title>\n<meta name=\"description\" content=\"Measure the pH value in the neutral range with the CALDUR\u00ae test set. Color chart pH 5-8, 300 determinations. Ideal for drinking water and aquariums!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Caldur\u00ae pH 5-8 - Colorimetric\" \/>\n<meta property=\"og:description\" content=\"Measure the pH value in the neutral range with the CALDUR\u00ae test set. Color chart pH 5-8, 300 determinations. Ideal for drinking water and aquariums!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/\" \/>\n<meta property=\"og:site_name\" content=\"RLS Wacon analytics\" \/>\n<meta property=\"og:image\" content=\"https:\/\/rls-wacon.de\/wp-content\/uploads\/2026\/03\/31-07238520-20Testset20pH205-8.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2067\" \/>\n\t<meta property=\"og:image:height\" content=\"1378\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Availability\" \/>\n\t<meta name=\"twitter:data1\" content=\"In stock\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/en\\\/produkt\\\/caldur-ph-5-8-colorimetric\\\/\",\"url\":\"https:\\\/\\\/rls-wacon.de\\\/en\\\/produkt\\\/caldur-ph-5-8-colorimetric\\\/\",\"name\":\"CALDUR\u00ae pH 5-8 test set - Colorimetric\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/en\\\/produkt\\\/caldur-ph-5-8-colorimetric\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/en\\\/produkt\\\/caldur-ph-5-8-colorimetric\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/rls-wacon.de\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/31-07238520-20Testset20pH205-8.jpg\",\"datePublished\":\"2026-03-12T10:34:14+00:00\",\"description\":\"Measure the pH value in the neutral range with the CALDUR\u00ae test set. Color chart pH 5-8, 300 determinations. Ideal for drinking water and aquariums!\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/en\\\/produkt\\\/caldur-ph-5-8-colorimetric\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/rls-wacon.de\\\/en\\\/produkt\\\/caldur-ph-5-8-colorimetric\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/en\\\/produkt\\\/caldur-ph-5-8-colorimetric\\\/#primaryimage\",\"url\":\"https:\\\/\\\/rls-wacon.de\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/31-07238520-20Testset20pH205-8.jpg\",\"contentUrl\":\"https:\\\/\\\/rls-wacon.de\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/31-07238520-20Testset20pH205-8.jpg\",\"width\":2067,\"height\":1378},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/en\\\/produkt\\\/caldur-ph-5-8-colorimetric\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Startseite\",\"item\":\"https:\\\/\\\/rls-wacon.de\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\\\/\\\/rls-wacon.de\\\/shop\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Caldur\u00ae pH 5-8 &#8211; Colorimetric\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/#website\",\"url\":\"https:\\\/\\\/rls-wacon.de\\\/\",\"name\":\"RLS Wacon analytics GmbH\",\"description\":\"Experts for water monitoring\",\"publisher\":{\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/rls-wacon.de\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/#organization\",\"name\":\"RLS Wacon analytics GmbH\",\"url\":\"https:\\\/\\\/rls-wacon.de\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/rls-wacon.de\\\/wp-content\\\/uploads\\\/2022\\\/10\\\/RLSWacon-analytics-Logo-BR-RZ-9_17-768x1591.png\",\"contentUrl\":\"https:\\\/\\\/rls-wacon.de\\\/wp-content\\\/uploads\\\/2022\\\/10\\\/RLSWacon-analytics-Logo-BR-RZ-9_17-768x1591.png\",\"width\":768,\"height\":159,\"caption\":\"RLS Wacon analytics GmbH\"},\"image\":{\"@id\":\"https:\\\/\\\/rls-wacon.de\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<meta property=\"og:availability\" content=\"instock\" \/>\n<meta property=\"product:availability\" content=\"instock\" \/>\n<meta property=\"product:condition\" content=\"new\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"CALDUR\u00ae pH 5-8 test set - Colorimetric","description":"Measure the pH value in the neutral range with the CALDUR\u00ae test set. Color chart pH 5-8, 300 determinations. Ideal for drinking water and aquariums!","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/","og_locale":"en_US","og_type":"article","og_title":"Caldur\u00ae pH 5-8 - Colorimetric","og_description":"Measure the pH value in the neutral range with the CALDUR\u00ae test set. Color chart pH 5-8, 300 determinations. Ideal for drinking water and aquariums!","og_url":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/","og_site_name":"RLS Wacon analytics","og_image":[{"width":2067,"height":1378,"url":"https:\/\/rls-wacon.de\/wp-content\/uploads\/2026\/03\/31-07238520-20Testset20pH205-8.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Availability":"In stock"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/","url":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/","name":"CALDUR\u00ae pH 5-8 test set - Colorimetric","isPartOf":{"@id":"https:\/\/rls-wacon.de\/#website"},"primaryImageOfPage":{"@id":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/#primaryimage"},"image":{"@id":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/#primaryimage"},"thumbnailUrl":"https:\/\/rls-wacon.de\/wp-content\/uploads\/2026\/03\/31-07238520-20Testset20pH205-8.jpg","datePublished":"2026-03-12T10:34:14+00:00","description":"Measure the pH value in the neutral range with the CALDUR\u00ae test set. Color chart pH 5-8, 300 determinations. Ideal for drinking water and aquariums!","breadcrumb":{"@id":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/#primaryimage","url":"https:\/\/rls-wacon.de\/wp-content\/uploads\/2026\/03\/31-07238520-20Testset20pH205-8.jpg","contentUrl":"https:\/\/rls-wacon.de\/wp-content\/uploads\/2026\/03\/31-07238520-20Testset20pH205-8.jpg","width":2067,"height":1378},{"@type":"BreadcrumbList","@id":"https:\/\/rls-wacon.de\/en\/produkt\/caldur-ph-5-8-colorimetric\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Startseite","item":"https:\/\/rls-wacon.de\/"},{"@type":"ListItem","position":2,"name":"Shop","item":"https:\/\/rls-wacon.de\/shop\/"},{"@type":"ListItem","position":3,"name":"Caldur\u00ae pH 5-8 &#8211; Colorimetric"}]},{"@type":"WebSite","@id":"https:\/\/rls-wacon.de\/#website","url":"https:\/\/rls-wacon.de\/","name":"RLS Wacon analytics GmbH","description":"Experts for water monitoring","publisher":{"@id":"https:\/\/rls-wacon.de\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/rls-wacon.de\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/rls-wacon.de\/#organization","name":"RLS Wacon analytics GmbH","url":"https:\/\/rls-wacon.de\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/rls-wacon.de\/#\/schema\/logo\/image\/","url":"https:\/\/rls-wacon.de\/wp-content\/uploads\/2022\/10\/RLSWacon-analytics-Logo-BR-RZ-9_17-768x1591.png","contentUrl":"https:\/\/rls-wacon.de\/wp-content\/uploads\/2022\/10\/RLSWacon-analytics-Logo-BR-RZ-9_17-768x1591.png","width":768,"height":159,"caption":"RLS Wacon analytics GmbH"},"image":{"@id":"https:\/\/rls-wacon.de\/#\/schema\/logo\/image\/"}}]},"og_availability":"instock","product_availability":"instock","product_condition":"new"},"_links":{"self":[{"href":"https:\/\/rls-wacon.de\/en\/wp-json\/wp\/v2\/product\/31586","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rls-wacon.de\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/rls-wacon.de\/en\/wp-json\/wp\/v2\/types\/product"}],"version-history":[{"count":0,"href":"https:\/\/rls-wacon.de\/en\/wp-json\/wp\/v2\/product\/31586\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rls-wacon.de\/en\/wp-json\/wp\/v2\/media\/31587"}],"wp:attachment":[{"href":"https:\/\/rls-wacon.de\/en\/wp-json\/wp\/v2\/media?parent=31586"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/rls-wacon.de\/en\/wp-json\/wp\/v2\/product_brand?post=31586"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/rls-wacon.de\/en\/wp-json\/wp\/v2\/product_cat?post=31586"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/rls-wacon.de\/en\/wp-json\/wp\/v2\/product_tag?post=31586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}