HANNA HI7001M pH Buffer Reference Standard Solution for Calibration, pH 1.68 At 25C, 230mL $16.99 Quantity discounts available QuantityPrice SKU: HAN-HI7001M BRAND: Hanna Instruments Inc. *Item is not in stock. This item normally carries a 5-10 day lead time. Get Notified When Available We'll email you when HANNA HI7001M pH Buffer Reference Standard Solution for Calibration, pH 1.68 At 25C, 230mL is back in stock or available for preorder. Please get in touch with Customer Service or your Jade Scientific, Inc. sales representative if you want to find an in-stock alternative. Name Last name Email Address (required)Subscribe to marketing emails. Get notified Quantity -+ Add to Cart