Zero calibration water for dissolved oxygen meter HI7040L 1 bottle

Zero dissolved oxygen calibration water 500mL This is zero calibration water for DO meters (dissolved oxygen). Measurements are often performed using only air calibration (100%), but when reliability is required, please also use zero calibration water. The capacity is 500mL. <How to use> 1. Add all of the HI 7040-1 (powder) included with the product into HI 7040-2 (liquid). 2) Close the cap tightly and shake upside down about 10 times to mix. 3. Pour into a beaker etc. and use. Store the remaining portion with the cap closed. *Store away from direct sunlight and in a cool, dark place at room temperature without humidity. ④Once opened, use the bottle within one month. *If the product is unopened, it is valid until the date printed on the product. If you have transferred the product from the bottle to a beaker or other container, please discard it on the same day. Please note that the actual capacity may vary slightly from the capacity indicated.