{"product_id":"hanna-instruments-hi-4000-47-ph-4-and-7-buffer-with-chloride-background","title":"Hanna Instruments HI-4000-47 pH 4 and 7 Buffer with Chloride Background","description":"\u003cp\u003eHI-4000-47 is a set of pH 4 and pH 7 buffer packets (includes 10 packets of each buffer). These buffer packets contain chloride ions to allow an inner electrode check of the ammonia and carbon dioxide Ion Selective Electrodes.\u003c\/p\u003e\u003cp\u003eBefore assembling an ammonia or carbon dioxide ISE for the first time, or if reactivating after storage, the inner glass assembly should be conditioned and tested as a pH electrode. The pH buffer packets can be added to 50 mL of deionised or distilled water and the sensor assembly carefully immersed in solution. When the mV measurement in each buffer solution is stable and recorded, the mV difference can be calculated.\u003c\/p\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":57640061174133,"sku":"HI-4000-47","price":87.68,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5511\/6439\/files\/4-and-7-buffer-with-chloride-background.jpg?v=1791580094","url":"https:\/\/testallwater.co.uk\/products\/hanna-instruments-hi-4000-47-ph-4-and-7-buffer-with-chloride-background","provider":"Test All Water","version":"1.0","type":"link"}