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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 15C to 30C 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.

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


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Advanced Design Superior Perfomance

ORP & Temperature Pen

Package Contents

PT1 Pocket Test Pen - battery installed
Pocket Clip
Operating Instructions


Standard Solutions for calibration:
The ULTRAPEN PT3 requires Myron L Company 80mV Quinhydrone, 260mV Quinhydrone, or 470mV MLC Lights ORP Standard Solutions for wet calibration and Sensor Storage Solution for proper storage.
Order model#s: ML-ORPCALKIT for ORP Calibration Kit - includes all required solutions and powders for 80mV, 260mV, and 470mV calibration solutions

Replacement ORP Sensor:
The ULTRAPEN PT3 features a user replaceable ORP sensor. Installation instructions included with sensor.
Order model#: ML-RPT3

ORP Electrode Cleaning Paper:
Routinely cleaning the electrode will keep the sensor free of build-up that can affect the speed and accuracy of ORP readings. Instructions for use are included with the paper.
Order model#s: ML-OECP-25  for quantity of 25


The PT2, excluding the pH sensor, has a one (1) year limited warranty. The pH sensor has a six (6) month limited warranty.

Brochure and Operation Manual for Download

Ultrapen_PT3_Data Sheet (includes specifications and options) PDF

Ultrapen_PT3_Operation Manual PDF
-1000 mV to +1000 mV
0 - 71 C / 32 - 160 F
10 mV
0.1 C / 0.1 F
1 mV ORP
0.1 C / 0.1 F
Time to Reading Stabilization: 10-45 seconds       
Power Consumption: Active Mode 37 mA, Sleep Mode 2 A       
Temperature Compensation: Automatic In Calibration Mode From 15C to 30C *      
Physical Dimensions: 17.15 cm L x 1.59 cm D or 6.75 in. L x .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: N type, Alkaline, 1.5V       
Calibration Solutions: ORP80, ORP260, ORP470
Operating/Storage Temperature: 0 - 55C or 32 - 131F       
Enclosure Ratings: IP67 and NEMA 6       
* 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 15C to 30C) 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: @25C, ORP2602OZ calibration solution will read 260mV, however @ 20.0C ORP2602OZ will read 265mV.