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Ultrapen PT5 Dissolved Oxygen (DO) and Temperature Pen

Ultrapen PT5 Dissolved Oxygen (DO) and Temperature Pen

ULTRAPEN™ PT5 Benefits:

  • Reliable Repeatable Results
  • Accurate
  • Affordable
  • Easy to Use
  • Rugged Design
  • Ensure Product Quality
  • Reduce Waste
  • Protect the Environment

ULTRAPEN™ PT5 High Performance Features:

  • Industry Leading Accuracy
  • Display DO in Concentration, % Saturation, or Both
  • Adjustable for Altitude and Salinity
  • 3 Calibration Methods: Air, Water and 0 ppm DO
  • Dynamic Membrane Temperature Correction
  • Live or Hold Mode – User Selectable
  • Auto-Off Feature – User Adjustable
  • Proprietary Sensor Design
  • Easy to Use – One Button Control
  • Rugged Design with Aircraft Aluminum Body
  • Durable, Epoxy Encapsulated Electronics
  • Waterproof
  • Powered by One N Type Battery (Included)


  • PT5 Pocket Tester Pen – Battery Installed
  • User Replaceable DO Sensor – Installed
  • Membrane Cap Assemblies – 3 each
  • DO Reference Electrolyte Solution – 2 oz.
  • Syringe with Tip
  • Protective/Hydration Cap
  • Pocket Clip
  • Quick Start Guide

ULTRAPEN™ PT5 Measurement Modes:

Hold Displays real-time readings until stable or 3 minutes, whichever comes first, then displays final readings.
LIVE Displays real-time readings continuously for up to 5 minutes.

ULTRAPEN™ PT5 Parameter Modes:

DO Default Display alternates between DO Concentration in ppm, DO Saturation in % and Temperature.
DO Concentration Display alternates between DO Concentration in ppm and Temperature.
DO Saturation Display alternates between DO Saturation in % and Temperature.

ULTRAPEN™ PT5 Specifications:

Specifications DO Concentration DO Saturation Temperature
Ranges 0-20 ppm 0-200% 0 – 71°C / 32 – 160°F
Accuracy1 ± 0.2 ppm or ± 2% of the reading, whichever is greater (up to 40°C) 0.0% to ≤ 100.0%: ± 20 counts; >100%: ± 2% of the reading. ± 0.1°C
Resolution 0.01 ppm 0.1% 0.1°C/F
Altitude Adjustment: -2,000 ft. to 15,000 ft. in increments of 100 ft.
Salinity Adjustment: 0 – 50 ppt in increments of 1 ppt
Time to Reading Stabilization: 10 – 180 seconds
Calibration Methods: 1 or 2 Point; 0 ppm DO Calibration Solution, Air or Water
Operating/Storage Temperature: 0 – 55°C / 32 – 131°F
Power Consumption: Active Mode: 30 – 140 mA, Sleep Mode: 2 μA
Temperature Compensation for Membrane Permeability: Automatic
Physical Dimensions: 17.15 cm L x 1.59 cm D or 6.75 in. L x .625 in. D
Weight: 54 g or 1.94 oz.
Case Material: Anodized Aircraft Aluminum with Protective Coating
Battery Type: N type, Alkaline 1.5 V
Water Resistance: IP67 and NEMA 6
EN61236-1: 2006 – Annex A: 2008; 1999/5/EC Annex III: Electrostatic discharge to case of instrument may cause PT5 to spontaneously power ON. In this case, the PT5 will power OFF after several seconds.
WARNING! These products can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

1Accuracy after Temperature Controlled, Full Calibration.

ULTRAPEN™ PT5 Applications:

  • Municipal Drinking Water
  • Municipal Wastewater Treatment
  • Pool and Spa
  • Industrial Water (boilers and cooling systems)
  • Fruit and Vegetable Rinse
  • RO Membrane
  • Aquaculture
  • Aquaponics
  • Poultry Processing
  • Poultry Drinking Water
  • Industrial Canned and Bottled Food Plants
  • Greenhouse
  • Pharmaceutical Manufacturing
  • Well Water
  • Brewing/Home Brewing

Click to order Standard Solutions and Buffers

DOSOL: 0 ppm Dissolved Oxygen Calibration Solution

The PT5, excluding the sensor and battery, has a one (1) year limited warranty. The DO sensor has a six (6) month limited warranty.

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: PT5, PTBT5, BATT11768, BATT11768-B3, RPT5, PTSC2, DOM5, DOSRE, DORS & DOM5K

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