| Identification |
| Model / SKU | PT5 |
| Brand | Myron L® Company |
| Product Type | Ultrapen™ handheld instrument |
| Measures | Dissolved Oxygen & Temperature |
| Country of Origin | United States |
| Measurement |
| DO Concentration Range | 0-20 ppm |
| DO Saturation Range | 0-200% |
| DO Accuracy | ±0.2 ppm or ±2% of reading, whichever is greater (to 40 °C) |
| DO Saturation Accuracy | 0.0% to ≤100.0%: ±20 counts; >100%: ±2% of reading |
| Resolution | 0.01 ppm / 0.1% saturation |
| Temperature Range | 0-71 °C / 32-160 °F |
| Altitude Adjustment | Supported — see data sheet |
| Physical & Power |
| Temperature Compensation | Automatic to 25 °C |
| Battery | One N-type alkaline 1.5 V (installed) |
| Operating / Storage Temperature | 0-55 °C / 32-131 °F |
| Body | Aircraft aluminium, epoxy-encapsulated electronics, waterproof |
| Physical Dimensions | 17.15 cm L × 1.59 cm D / 6.75 in. L × 0.625 in. D |
| Weight | 54 g / 1.90 oz |
What is in the box
PT5 pocket tester pen with battery installed, protective cap and user-replaceable dissolved-oxygen sensor (installed)
Warranty
Two (2) Year Limited Warranty on the instrument. Warranty is limited to repair or replacement at the manufacturer’s discretion and excludes damage from abuse, tampering or environmental extremes.
WHERE THIS IS USED — 2 APPLICATIONS
Myron L publishes an application bulletin for each of these. The summaries below are ours; the linked bulletins are Myron L’s own and open in a new tab.
Environmental Monitoring
Wastewater, stormwater, surface water
Discharge to waterways, to municipal sewers and increasingly stormwater runoff all sit under permit limits, and demonstrating compliance means measuring at many points rather than one. Conductivity, pH, ORP, dissolved oxygen and nitrate together characterise both the health of a receiving water and the quality of an effluent, and handheld instruments make it practical to sample where the water actually is.
Measured here: Conductivity / TDS, pH, ORP, dissolved oxygen, nitrate, temperature
📄 Environmental Monitoring Application Bulletin (PDF)Hydroponics
Controlled-environment agriculture
With no soil to buffer it, the nutrient solution is the entire root environment, and managing it is the whole job. Conductivity gives the dissolved nutrient strength and pH governs which of the seventeen required elements the roots can actually take up. Both drift as plants feed and as water evaporates, so they are checked and corrected far more often than in soil growing.
Measured here: Conductivity / TDS, pH, temperature, dissolved oxygen
📄 Hydroponics Application Bulletin (PDF)Application areas are those in which the Myron L® Company’s own application bulletin names this instrument. Bulletins are reproduced unaltered with Myron L’s copyright notices intact. Suitability for a specific installation should be confirmed with us before purchase.
Specifications taken from the Ultrapen™ PT5 Data Sheet and myronl.com, published by the Myron L® Company. Myron L reserves the right to change design, specifications and prices without notice — please confirm critical figures with us before purchase. Myron L®, Ultrameter®, Ultrapen™, UltrapenX2™, TechPro™, PoolPro™, bluDock™, Guardian2™, FCE™ and 442 Natural Water™ are trademarks of the Myron L Company. VALOX® is a registered trademark of SABIC. Bluetooth® is a registered trademark of Bluetooth SIG, Inc.
