Myron L Ultrapen PT1 Waterproof Total Dissolved Solids (TDS) and Salinity Tester

The advanced four-electrode cell for conductivity/ resistivity/TDS eliminates polarization, allowing greater accuracy and stability with minimal maintenance
IP67/NEMA 6 rated Ultrameter II‘s are waterproof and buoyant and can be fully immersed to 3 feet/1 meter
Ample memory provides increased flexibility to record and store 100 separate readings. Real Time Clock with Date & Time Stamp allows you to maintain the integrity of each individual reading.
While priced like affordable single-parameter instruments, the Ultrameter II does the job of three, four or even six instruments.
When calibration is necessary, display prompts simplify . Plus, all parameters (excluding factory-set temperature) have an internal electronic setting that can be used for field calibration 
Accuracy of ±1% of reading ±.2% at calibration point
Accuracy of benchtop lab equipment in an affordable, portable, compact pen
Autoranging; automatic temperature compensation
Reliable Repeatable Results
Rugged, reliable, shock-resistant fully encapsulated electronics, body constructed of aircraft aluminum
Specially designed with measurement ranges and solution modes to meet the water quality testing needs of many applications
Simple one button function
Boilers, cooling towers, hydroponics, wastewater...