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Ultrapen PT3 ORP/Redox and Temperature Pen

Ultrapen PT3 ORP/Redox and Temperature Pen

This instrument is designed to be extremely accurate, fast, and simple to use in diverse water quality applications. Advanced features include highly stable microprocessor-based circuitry; automatic temperature compensation from 15°C to 30°C while in calibration mode; user-intuitive design; and waterproof housing. A true one-handed instrument, the PT3 is easy to calibrate and easy to use. To take a measurement, you simply push a button then dip the PT3 in solution. Results display in seconds.

ULTRAPEN™ PT3 Benefits:

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

ULTRAPEN™ PT3 High Performance Features:

  • Accuracy of ±10 mV ORP
  • Proprietary Sensor Design
  • 99.9% Pure Platinum Electrode
  • 3 Calibration Options with Automatic Solution Recognition
  • Automatic Temperature Compensation in Calibration Mode*
  • Rugged, reliable, shock-resistant fully encapsulated electronics
  • Durable body constructed of aircraft aluminum
  • Simple one-button functions
  • Temperature Readout
  • High capacity N-type battery included
  • Waterproof


  • PT3 Pocket Tester Pen – Battery Installed
  • User Replaceable ORP Sensor – Installed
  • Protective/Hydration Cap
  • Scoop
  • Pocket Clip
  • ORP Electrode Cleaning Paper
  • Quick Start Guide

ULTRAPEN™ PT3 Functions:

Hold (default) Once stabilized, the readings are captured then displayed
LIVE Real-time readings are displayed continuously during measurement

* Temperature compensation in calibration mode: Temperature affects the reaction potentials for all chemicals differently. True ORP is the direct measurement of electron activity during an oxidation-reduction reaction, regardless of temperature. However, for maximum accuracy and ease of calibration, the Myron L® Company has developed three calibration standard solutions with known dissolved species. We derived the temperature compensation (from 15°C to 30°C) for those solutions, and embedded automatic temperature compensation into the calibration function of your PT3. Note: To verify calibration while in measurement mode, you must manually correct for any variation in temperature. Example: @25°C, ORP2602OZ calibration solution will read 260mV, however @ 20.0°C ORP2602OZ will read 265mV.

ULTRAPEN™ PT3 Specifications:

ORP Range: -1000 mV to +1000 mV
ORP Accuracy: ± 10 mV
ORP Resolution: 1 mV ORP
Temperature Range: 0 - 71°C / 32 - 160°F
Temperature Accuracy: ±0.1°C
Temperature Resolution: 0.1°C/0.1°F
Time to Reading Stabilization: 10 – 45 seconds
Power Consumption: Active Mode: 30 – 140 mA, Sleep Mode: 2 μA
Temperature Compensation: Automatic In Calibration Mode From 15°C to 30°C
Physical Dimensions: 17.15 cm L x 1.59 cm D or 6.75 in. L x 0.625 in. D
Weight: 50.4 g / 1.78 oz. (without soaker cap and lanyard)
Case Material: Anodized Aircraft Aluminum with Protective Coating
Battery Type: One N type, Alkaline, 1.5V
Calibration Standard Solutions: ORP80, ORP260, ORP470
Operating/Storage Temperature: 0 - 55°C / 32 - 131°F
Enclosure Ratings: IP67 and NEMA6
EN61236-1: 2006 – Annex A: 2008: Electrostatic discharge to the PT3 may cause it to spontaneously turn on. If this occurs, the PT3 will turn off.
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

ULTRAPEN™ PT3 Applications:

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

Click to order Standard Solutions and Buffers

The ULTRAPEN™ PT3 requires Myron L® Company 80mV Quinhydrone, 260mV Quinhydrone, or 470mV MLC Light's ORP Standard Solutions for wet calibration and Sensor Storage Solution for proper storage.

The PT3, excluding the sensor and battery, has a one (1) year limited warranty. The ORP 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: PT3, PTBT3, BATT11768, BATT11768-B3, RPT3, PTSC, OECP-25 & OECP-100

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