PT4 Free Chlorine Equivalent and Temperature Pen


Brand: Myron L
Product Code: PT4

992 in stock


PT4 Ultrapen PT4 Free Chlorine Equivalent (FCE) and Temperature Pocket Tester Pen by Myron L

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.  


  • Battery installed
  • Soaker cap
  • Scoop
  • Pocket Clip
  • Holster
  • Lanyard
  • ORP Electrode Cleaning Paper
  • Operating instructions


  • Accuracy of up to ±0.3 ppm FCE
  • Proprietary Sensor Design
  • Calibration with pH and ORP Standard Solutions
  • Automatic Temperature Compensation
  • Temperature Readout
  • Waterproof
  • Powerd by one N Type Battery (included)


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

NEW! FCE 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.


FCE Range 0 – 10.0 ppm
Temperature Range 0 – 71°C / 32 – 160°F
FCE Accuracy < 5.00 ppm ± 0.3 ppm
≥ 5.00 ppm ± 0.5 ppm
Temperature Accuracy ± 0.1ºC / ± 0.1ºF
FCE Resolution 0.01 ppm
Temperature Resolution 0.1ºC / 0.1ºF
Time to Reading Stabilization 10 – 45 seconds
Power Consumption Active Mode 37 mA, Sleep Mode 2 µA
Temperature Compensation Automatic In Calibration Mode From 15ºC to 30ºC
Physical Dimensions 17.15 cm L x 1.59 cm D / 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, 1.5 V
Calibration Standard Solutions pH4, pH7, pH10, ORP80, ORP260, ORP470
Operating/Storage Temperature 0 – 55ºC / 32 – 131ºF
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.
Warranty The PT4, excluding the FCE sensor, has a one (1) year limited warranty.
The FCE sensor has a six (6) month limited warranty.

Additional information