Apera Instruments 5052 Saltwater Salinity Pen Tester

The Apera 5052 is a pocket-size saltwater salinity pen tester purpose-built for marine and saltwater aquarium applications. Part of the Eco Series, it features a dedicated fixed saltwater salinity sensor calibrated for the higher salinity ranges found in marine environments — delivering fast, accurate readings without the complexity of a full benchtop instrument. Lightweight at just 6 oz, the 5052 slips into any pocket or aquarium toolkit for instant, on-the-spot salinity verification.

Why Choose the Apera 5052?

• Saltwater-Specific Sensor — dedicated fixed probe calibrated for marine salinity ranges; more accurate for saltwater than general-purpose salinity testers
• Ultra-Compact & Lightweight — 6 oz; fits in any pocket, aquarium kit, or field bag for true on-the-go testing
• Simple Point-and-Read Operation — no complex menus; instant salinity verification for reef keepers, marine hobbyists, and field technicians
• Cost-Effective — professional-grade accuracy at an economical price; no refractometer or expensive lab instrument required
• Easy Maintenance — rinse and store at room temperature (15–25°C); minimal upkeep required

Ideal Applications

• Saltwater and reef aquariums: routine salinity and specific gravity monitoring
• Marine environmental field testing: coastal and estuarine water quality
• Aquaculture: seawater salinity verification for marine species
• Research and education: marine science field sampling

Eco Series Model Comparison

Technical Specifications