{"product_id":"9781591030027","title":"ECG Ruler Pocketcard","description":"\u003cp\u003eProfessional ECG ruler, for reading: 2 x RR (25 mm\/s) 1 x RR (50 mm\/s) 3 x RR (25 mm\/s) 3 x RR (50 mm\/s) 4 x RR (25 mm\/s) Amplitudes (mV) Times, intervals (s) Conversion: heart rate - RR interval Table. heart rate - PR interval - relative QT interval\u003c\/p\u003e","brand":"Borm Bruckmeier Publishing, LLC","offers":[{"title":"Default Title","offer_id":47035331674352,"sku":"9781591030027","price":4.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9781591030027_p0.jpg?v=1763810957","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9781591030027","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}