Aquarium Solutions Airline Check Valve Clear, Black 2 pk

Durable Construction For Extended Life

• "Dry Hands" design avoids contamination of aquarium or water
• Takes a more "true" water sample at a 6 inch depth, avoiding inaccurate surface sampling
• Accurate to ±0.001 specific gravity and salinity (PPT) measurements
• Auto temperature-correcting design to give a temperature-corrected reading in warm water aquariums - 68°F to 85°F (20°C to 30°C)
• Readings can be taken in or outside the aquarium
• Self-leveling, hanging device collects perfect samples
• Scientifically verified design offers the ultimate in accuracy