Bluelab pH 4.0 and pH 7.0 Calibration Solution
pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7.0 first (buffer) then to pH 4.0 (slope). Calibration Solution should be stored in a cool place out of direct sun and heat. They should be stored with the lids securely tightened.
The blue lab 2.77 calibration solution wait until the reading stops moving this may take a minute or two press the Cal button down on the pen waltz in the solution
At Hydro Worlds, we are doing all we can to make sure your package arrive in a timely manner.
We offer these methods for shipping your orders:
FedEx Premium Shipping - 2-4 business days
UPS Ground Shipping - 3-7 business days
Shipping Methods & Transit Times
Most orders are shipped the same day or the next day, depending on what time we receive the order. It may take longer if we are temporarily out of stock. You can find estimated shipping time on the product page.
Your orders will ship based on the shipping method selected once orders are fulfilled. Upon fulfillment, a tracking number will be provided and you are able to track the shipment via your account. Please allow 72 hours for tracking to update.
We are unable to edit orders once processed.
In the rare event that you experience a quality issue, please contact us right away. Images or video clearly showing the problem must be provided within a week of delivery, along with a detailed description and a photograph of your full packing slip. Refunds or credits are not guaranteed and are reviewed on a case by case basis. Hydro Worlds conducts strict quality control processes where orders are checked and verified before being processed and packed. If an issue is determined, we will do our best to satisfactorily resolve the matter at hand.
Stolen or lost packages
We are not responsible for stolen or lost packages, including those with a "Signature Release" on file. Please file a claim with the courier responsible for delivering your package.
Please ensure that your delivery address is correct, as we are not responsible for orders shipped to incorrect addresses or unclaimed. It is not possible to re-route a package once it has been shipped. If your package is returned due to an incorrect address, we can arrange a redelivery. However, a re-delivery fee will be charged for this service according to the carrier.
Shipping delays caused by courier issues, customs, import regulations, and weather conditions are possible and out of our control.