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Ultrapen PT1 (EC)/TDS/Salinity Pen

Ultrapen PT1 (EC)/TDS/Salinity Pen

This instrument is designed to be extremely accurate, fast and simple to use in diverse water quality applications. Advanced features include the ability to select from 3 different solution types that model the characteristics of the most commonly encountered types of water; proprietary temperature compensation and TDS conversion algorithms; highly stable microprocessor-based circuitry; user-intuitive design; and waterproof housing. A true, one-handed instrument, the PT1 is easy to calibrate and easy to use. To take a measurement, you simply press a button then dip the pen in solution. Results display in seconds.


  • Accuracy of ±1% of READING ±.2% at calibration point
  • Reliable Repeatable Results
  • Automatic temperature compensation
  • Autoranging
  • Accuracy of benchtop lab equipment in an affordable, portable, compact pen
  • Rugged, reliable, shock-resistant fully encapsulated electronics, body constructed of aircraft aluminum
  • Simple one button function
  • Specially designed with measurement ranges and solution modes to meet the water quality testing needs of many applications
  • High capacity N-type battery included
  • Waterproof


  • Agriculture
  • Hydroponics
  • Desalination
  • Aquaculture
  • Pharmaceutical
  • Boilers and Cooling Towers
  • Fountain Solutions for Printing
  • Horticulture
  • Wastewater
  • Pool and Spa
  • Food and Beverage
  • Irrigation
  • Reverse Osmosis


Measurement Range: 1 - 9999 μS or ppm (0.0010 - 9.999 ppt salinity)
Accuracy: ± 1% of reading
Repeatability: < 1000 μS or ppm ± 1 Count
≥ 1000 μS or ppm ± 0.3% of reading
Resolution: Electical Conductivity (EC) and TDS:
0.1 for 1.0 - 99.9 μS or ppm
1 for 100 - 9999 μS or ppm
0.0001 for 0.0010 - 0.0999 ppt
0.001 for 0.100 - 9.999 ppt
0.1 °C or °F
Time to Reading Stabilization: 10 - 20 seconds
Active Mode Power Consumption: 30 - 100 mA
Sleep Mode Power Consumption: 2 μA
Temperature Measurement Range: 0 - 71 °C or 32 - 160 °F
Temperature Accuracy Displayed: ± 0.1 ºC or ± 0.2 ºF
Temperature Compensation Method: Automatic to 25 °C
Physical Dimensions: 17.15 cm L x 1.59 cm D or 6.75 in. L x .625 in. D
Weight: 55 g or 1.94 oz.
Case Material: Anodized Aluminum with UV Protective Coating
Battery Type: N type, Alkaline
Battery Voltage: 1.5 V
Calibration Solution Point: 1800 μS KCl; 3000 ppm 442™ (2027 ppm NaCl)
Operating/Storage Temperature: 0 - 55°C or 32 - 131°F
Water Resistance: IP67 and NEMA 6
EN61236-1: 2006 – Annex A: 2008; 0995/5/EC Annex III:  Electrostatic discharge to case of instrument may cause PT1 to spontaneously power ON. 
In this case, the PT1 will power OFF after several seconds.


Mode Parameter Solution Model Units
Cond KCl (EC) Potassium Chloride microsiemens (μS)
tdS 442 Total Dissolved Solids (TDS) 442™ Myron L® Natural Water Standard parts per million (ppm)
tdS NaCl TDS Sodium Chloride ppm
SALt 442 Salinity 442™ Myron L® Natural Water Standard parts per thousand (ppt)
SALt NaCl Salinity Sodium Chloride ppt

Click to order Standard Solutions and Buffers

Standard Solutions for calibration: MODEL#s: KCL-1800, 442-3000 (2027 ppm NaCl)

Excepting the battery, the Myron L® PT1 Conductivity/TDS/ Salinity Pen is warrantied to be free from manufacture defect for 1 year.

Includes battery installed, protective cap, scoop, pocket clip, holster, lanyard, quick start guide

Click for Operation Manuals / Instructions

Myron L® Ultrapen™ Series units have probes that can freeze and break and must ship 2nd Day Air with a heat pack.
Ignoring this requirement voids the warranty.

  • Models: PT1, PTBT1, BATT11768, BATT11768-B3, PTSC1 & MC

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