Apera Instruments 5052 Saltwater Salinity Pen Tester – Marine & Aquarium Meter

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

Model	Parameter	Best For
5021	Conductivity (EC)	General water conductivity & hydroponics
5031	TDS	Drinking water, RO systems, purity checks
5041	ORP	Pools, spas, disinfection monitoring
5051	Salinity	General salinity monitoring
5052	Saltwater Salinity	Saltwater aquariums & marine testing
5053	NaCl Salinity	Sodium chloride concentration checks

Technical Specifications

Parameter	Specification
Measured Parameter	Saltwater Salinity
Sensor Type	Fixed, dedicated saltwater salinity sensor
Format	Single Unit (1-EA)
Storage Conditions	15–25°C (room temperature)
Weight	6 oz (approx. 0.375 lbs)
Series	Eco Series Compact Pen Testers