Who is John Galt? Bumper Sticker Fast and accurate results. No need to work with color charts or messy test strips; Large digital display makes it easy to read BONUS Package - Alkaline Food Chart + 21 Alkaline Recipes will be emailed as a PDF after your purchase. ***CALL US 1-800-790-6779*** or email us via Amazon along with your ORDER ID if you don't get the BONUS items in your email. Auto calibration button and included buffer powders enable you to test the pH of your pool, aquarium, water, food or anything in a snap Super convenient and mess free; Just turn it on, dip in liquid and read display, nothing could be easier Designed for portability; Pocket sized, handheld pH meter is lightweight, compact, conveniently fits in your pocket or bag and goes anywhere Ideal for household or laboratory use; Suitable for testing pH balance of drinking water, pool, aquarium, RO system, Spa, or hydroponics; Appropriate for wide range of applications