HM Digital 1000 ppm TDS Calibration Solution, 3 oz (90 ml)

All items are drop shipped to you directly from Hawthorne Gardening. All returns will be sent to the closest Hawthorne Gardening in your area. Hawthorne will only authorize returns for defective or damaged items. Hawthorne will not take back any items that you decide you do not like, or if the item is not what you expected. It is recommended to check out items in your local grow shop or talk to the manufacturer about scheduling a product demo at a local store to make sure the items are the right fit for your gardening needs and work as described by the manufacturer.