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Ultrapen PT4 Free Chlorine Equivalent and Temperature Pen

Ultrapen PT4 Free Chlorine Equivalent and Temperature Pen

ULTRAPEN™ PT4 is Myron L® Company's ground breaking, new Pocket Tester for measuring Free Chlorine Disinfecting Power, Free Chlorine Equivalent (FCE), as well as Temperature. It is waterproof and designed to be extremely accurate, fast, and simple to use in diverse water quality applications.

ULTRAPEN™ PT4 Benefits:

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

NEW! FCE TM Free Available Chlorine (FAC) Function
The Myron L® Company FCE function reports FAC quickly and accurately by measuring ORP, the chemical characteristic of chlorine that directly reflects its effectivity, cross referenced with pH. Both DPD kits and colorimeters may tell the user the FAC value of the sample in the test tube, but since the chemistry of that sample is quite different from the source water being analyzed, the results are imprecisely related to actual disinfection power. The Myron L® Company FCE function measures the real, unaltered chemistry of source water, including moment-to-moment changes in that chemistry.

ULTRAPEN™ PT4 High Performance Features:

  • Accuracy of up to ±0.3 ppm FCE TM
  • Calibration with pH and ORP Standard Solutions
  • Automatic Temperature Compensation
  • 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)


  • PT4 Pocket Tester Pen – Battery Installed
  • User Replaceable FCE TM Sensor – Installed
  • Protective/Hydration Cap
  • Scoop
  • Pocket Clip
  • ORP Electrode Cleaning Paper
  • Quick Start Guide

ULTRAPEN™ PT4 Measurement Modes:

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

ULTRAPEN™ PT4 Specifications:

FCE TM Free Chlorine Range: 0 – 10.0 ppm
FCE TM Free Chlorine Accuracy: < 5.00 ppm: ± 0.3 ppm, ≥ 5.00 ppm: ± 0.5 ppm
FCE TM Free Chlorine Resolution: 0.01 ppm
Temperature Range: 0 - 71°C / 32 - 160°F
Temperature Accuracy: ±0.1°C
Temperature Resolution: 0.1°C/0.1°F
Power Consumption: Active Mode: 30 – 140 mA, Sleep Mode: 2 μA
Temperature Compensation: pH : Automatic to 25°C ORP: 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 .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: PH4, PH7, PH10, 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 PT4 may cause it to spontaneously turn on. If this occurs, the PT4 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™ PT4 Applications:

  • Agriculture
  • Hydroponics
  • Aquaculture
  • Pharmaceutical
  • Boilers and Cooling Towers
  • Horticulture
  • Wastewater
  • Food and Beverage
  • Irrigation
  • Reverse Osmosis
  • Plus Many More!

Click to order Standard Solutions and Buffers

The ULTRAPEN™ PT4 requires pH4, pH7, and pH10 pH Buffer Solutions and 80 mV Quinhydrone, 260 mV Quinhydrone, or 470 mV MLC Light's ORP Standard Solutions for wet calibration, and Sensor Storage Solution for proper storage.

The PT4, excluding the sensor and battery, has a one (1) year limited warranty. The FCE 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: PT4, PTBT4, BATT11768, BATT11768-B3, RPT4 & PTSC

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