5 in 1 Water Quality Checker Pen

Test pH, TDS, EC, salinity and temperature in one device. Know exactly what is in your cold plunge before you get in.

Take your water maintenance to a laboratory level with the Innie-Outie Hydro-Lab Pen. This rugged, IP67-rated digital device provides instant, high-precision readings for the five most critical indicators of water health: pH, Total Dissolved Solids (TDS), Electrical Conductivity (EC), Salinity, and Temperature. Whether you’re managing a high-end plumbed chiller system or a simple DIY tub, this pen gives you the hard data needed to verify your water’s chemical balance and purity in seconds—no color-matching guesswork required.

Key Features & Technical Specifications

Five-Parameter Precision: Measures pH, TDS, EC, Salinity, and Temperature in one compact, easy-to-use device.

Automatic Temperature Compensation (ATC): Ensures readings are always accurate, regardless of the temperature of the water being tested.

Pro-Grade Titanium Sensor: Durable, high-accuracy probe designed to withstand frequent use in the harsh, cold, and chemically treated environments of a recovery tub.

IP67 Waterproof & Rugged: Engineered for total protection against water ingress, making it the perfect tool to keep poolside or in your maintenance bag.

High-Visibility Backlit LCD: Large, clear screen makes it easy to read your data in any lighting, from a dark garage to bright, direct sunlight.

Key Benefits

Data-Driven Maintenance: Don't guess; know. Monitor your TDS and EC levels to see exactly when your water needs a change or when your filtration system is reaching its capacity.

Optimize Your Treatment: By monitoring your pH levels with laboratory-grade precision, you can use your chemical treatment bundle more efficiently, saving money and avoiding over-dosing.

Protect Your Equipment: High levels of salinity or TDS can lead to accelerated corrosion of chiller components; this pen alerts you to these risks before they turn into costly repairs.