Automatic Square Saltwater Hydrometer Salt Water Salinity Meter For Aquarium Marine Sea Saltwater Accurate Description: Foursquare Size:9*12cm Color:As the picture Package included: 1 x Hydrometer. 1 x Stick. Note: fit for warm water aquarium (20C -30C) Temperature changes will cause the reading changes. The accuracy of unit proportion is up to plus or minus 0.001. Feature: Accurate, durable, and easy to read sea water hydrometer. This product is designed with an automatic level function, can automatically identify the level to avoid errors. Very accurate measurement readings, please rest assured to purchase. And each hydrometer has a laser engraved patent number. Shipment : Item are shipped within 3-5 business days once full payment is settled.If you can't get your items in time,please contact to us first,we wil check and solve it for you soon.We will reply your mail within 24 hours normally. sometimes have a little delay due to the weekend or holiday.If you can't get our mail after 48 hours,please check your spam or contact to us with other mail address. Return & Warranty : Return : If item DOA(Dead of Arrival),Buyers Can return it in 14 Days,We will Replace it with New item after we receive DOA item.Please Contact us Before you sent the item back Warranty: All item Comes with Basic 3 Month Sellers Warranty,if item defective in 3 Month,We will offer replacement withour extra Charger(including shipping fee)After we Receive the Defective item. If item Defective after 3 Month,Buyers can still send it back,We will contact suppliers or Manufactory for Warranty.Buyers Might Need pay the Shipping fee For resend the replaced item. Feedback : We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback WITH 5 stars is very important We request that you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. It is impossible to address issues if we do not know about them!