{"product_id":"grow-gadgets-digital-ph-meter-pen","title":"Grow Gadgets Digital pH Meter Pen","description":"\u003cp\u003eThe Grow Gadgets pH pen is a simple \u003cstrong\u003edigital pH meter for plants\u003c\/strong\u003e: switch it on, dip it in the water or feed, and read the number. No colour charts and no squinting at test strips.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003eIt is a lovely first meter for anyone starting out with hydroponics, rainwater butts or fussy houseplants that like their water just so.\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch2\u003eA simple digital pH meter for plants and hydroponics\u003c\/h2\u003e\n\u003cp\u003eThe pen covers the full pH scale from 0 to 14 and adjusts for water temperature automatically, so a cold tap reading and a warm reservoir reading are both fair.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003eWhen the electrode eventually wears out, it can be replaced rather than throwing the whole meter away, which is kinder to your purse and the planet. Pair it with our pH buffer solution and a bottle of gentle pH down, and you have everything you need.\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch3\u003eWhen a pH pen comes in handy\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eChecking water for a countertop herb garden or hydroponic bucket\u003c\/li\u003e\n\u003cli\u003eTesting rainwater and tap water for ericaceous plants like blueberries\u003c\/li\u003e\n\u003cli\u003eAdjusting feed for tomatoes, chillies and salad\u003c\/li\u003e\n\u003cli\u003eA hands-on science lesson about acids and alkalis\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003ch3\u003eWhy this pH pen is so easy\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull 0 to 14 range.\u003c\/strong\u003e Reads anything from lemon juice to washing soda.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic temperature compensation.\u003c\/strong\u003e Fair readings in cool or warm water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-button use.\u003c\/strong\u003e Switch on, dip, read; an off button saves the battery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaceable electrode.\u003c\/strong\u003e Swap the sensor rather than the whole pen.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery powered.\u003c\/strong\u003e Small and light enough to keep in the potting shed drawer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003ch3\u003epH pen questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat pH should water be for plants?\u003c\/strong\u003e\u003cbr\u003e\nMost plants like slightly acidic water. Aim for pH 5.5 to 6.5 in hydroponics, and around 6.0 to 7.0 for compost-grown plants.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eCan I test soil with a pH pen?\u003c\/strong\u003e\u003cbr\u003e\nA pen like this is designed for liquids. Mix a little compost with distilled water, let it settle and test the water.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I calibrate it?\u003c\/strong\u003e\u003cbr\u003e\nUse pH 4 and pH 7 buffer solution and adjust the pen until it reads correctly. Do it every few weeks.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I store the pen?\u003c\/strong\u003e\u003cbr\u003e\nRinse the tip in clean water, replace the cap and keep it out of direct sun.\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch3\u003eThe details\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eMeasures\u003c\/th\u003e\n\u003ctd\u003epH of water and liquid feed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRange\u003c\/th\u003e\n\u003ctd\u003epH 0 to 14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTemperature compensation\u003c\/th\u003e\n\u003ctd\u003eAutomatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eElectrode\u003c\/th\u003e\n\u003ctd\u003eReplaceable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDisplay\u003c\/th\u003e\n\u003ctd\u003eDigital LCD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower\u003c\/th\u003e\n\u003ctd\u003eBattery powered; no mains plug needed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eGrow Gadgets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cbr\u003e\n\u003ch3\u003eIn the box\u003c\/h3\u003e\n\u003cp\u003eOne digital pH pen with protective cap.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eOne dip, one number, happier plants. Simple as that.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Grow Gadgets","offers":[{"title":"Default Title","offer_id":60146785649024,"sku":"GGDPHMP","price":21.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0758\/6529\/3075\/files\/PHProMeter01.jpg?v=1793884261","url":"https:\/\/theindoorgardencentre.co.uk\/products\/grow-gadgets-digital-ph-meter-pen","provider":"The Indoor Garden Centre","version":"1.0","type":"link"}