What a great product.
No need to run around looking for a pipette which could anyway be covered in salt creep :)
Just drop it on and calibrate. So easy you will find yourself calibrating before every water change :)

Anyone who owns a refractometer should buy this product. Having a fixed salinity to calibrate your equipment to is a no brainer. Stop relying on RO/DI water to calibrate your refractometer, you could be off and not even know it. I feel more comfortable now knowing that my equipment is correctly calibrated.

I tried using distilled (RO/DI) water, and was getting terribly inaccurate results. I didn't know that you actually can't get a good reading after calibrating with distilled water. After buying this calibration fluid, my readings are spot on, every time. This is a great product. Highly recommended.

Although they say you can calibrate a refractometer with distilled water, I would rather trust something that I know exactly what the SG is. This is something I would never go without. Must have to ensure proper calibration of your refractometer

Easy to use and get perfect readings for your gravity

If you have a refractometer, this is a must like the other review states. Quick and easy calibration to 35 ppt. Doesn't drip and isn't messy at all. I use to calibrate with RO water to 0 ppt and after using this I realized I was still slightly off. It makes a difference being able to calibrate against something close to natural salt water.

I actually talked to Michael Del Prete (Aquacraft CEO and Inventor) about this and this is what he had to say:

Testing salt water for the proper specific gravity or salinity is the first, easiest and most important part of all successful marine fish and reef aquariums.

Accurate calibration of a refractometer is essential.

The vast majority of refractometers do not read accurately when calibrated at -0- with RO, RO-DI or distilled water and salt water with a SG 1.026 / 35 ppt. salinity is tested.

A miscalibrated refractometer of +/- .002 SG units or +/- 2-3 ppt. salinity units will yield an inaccurate test result for calcium of +/- 75-100 ppm.

All other ions will be +/- according to their amounts present in the salt water solution.

Simply calibrate the refractometer at 35 ppt. salinity or 1.026 specific gravity using this precisely formulated scientific standard calibration solution.

Aqua Craft Products® Refractometer Calibration Solution has the same refractive index of 1.3394 @ 77F / 25C as natural sea water.

Learn your exact salt concentration and get accurate and reliable test results. Keep your captive marine pets in optimal living conditions.

This is the ONLY solution made specifically for calibrating refractometers for use in salt water.

Aqua Craft Products® Refractometer Calibration Solution is a must.

2 ounce / 60 ml size. With daily use of RCS, this will last about one year.

Dropper top. Simply put a few drops on the refractometer lens. No spilling. No wasted solution. No mess.

Instructions and contents are clearly labeled.

Like all Aquacraft products, this is made in the USA using proprietary methods and strict quality measures.

I have been using this for about a year now and still have some left. A little goes a long way. This is a "must have" if you use a refractometer.