I have used almost every type of specific gravity including expensive refractometers. Besides being expensive, they often need to be calibrated and are difficult to use. Coralife floating arm hydrometers never need to be calibrated. Season it with salt water for the first 24 hours, then rinse with fresh water after each use and you'll be trouble-free for years. I tested them on refractometers, accuracy +-0.001. In any case, stability is known to be much more important than perfect accuracy.
Enhance Your Aquascape With Greenpro'S Anubias Nana Marble White Pinto Nano Mini Tissue Culture
10 Review
π‘οΈ Advanced GXSTWU Digital Reptile Tank Hygrometer Thermometer: LCD Display, Hook, Temperature & Humidity Gauge for Reptile Tanks, Terrariums, Vivarium
3 Review
π JOR Refractometer: Accurate Dual-Range Scale Device for Measuring Salinity and Specific Gravity in Saltwater Aquariums and Reef Tanks - No Batteries Needed!
3 Review
Greenpro Live Potted Aquarium Plants Package - 3 Water Ferns (Bolbitis Windelov And Pteropus), Hardy Leaf For Freshwater Fish Tank
8 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review
Mini pump Xiaomi Mijia Electric Pump 1S, plastic, black
55 Review
Vacuum cleaner TEQQO Aquastick 3 in 1 Power, grey/turquoise
26 Review
𧲠Efficient Magnetic Fish Tank Cleaner: KEDSUM Floating Clean Brush with Handle Design
34 Review