Easily track Delta T and more on the job
The Fieldpiece ST4 Dual-Temperature Meter helps you measure two temps at once—perfect for quick Delta T checks and spotting blocked filters or system issues faster.
Built for real-world HVAC work
Designed for changing conditions, the ST4 gives you stable readings even in rapidly shifting environments. Simple, accurate, and ready for everyday use.
- ✅ Displays T1, T2, and T1-T2 split readings clearly on a large LCD
- ✅ Comes with two K-type beaded thermocouples for instant use
- ✅ Fast-reacting tech handles field temperature changes smoothly
- ✅ Front-facing calibration pots for on-the-go accuracy
- ✅ Includes magnetic hanger and clear nylon carry case
- ✅ Works with wet bulb and pipe clamp probes (sold separately)
Specifications
Perfect for HVAC techs needing solid performance, fast response times, and reliable accuracy every time.
- ✅ Probe length: 94 mm
- ✅ Operating range: 0°C to 40°C, less than 90% RH
- ✅ Storage range: -10°C to 60°C, less than 70% RH
- ✅ Battery: 2 x AAA (installed)
- ✅ Battery life: 40 hrs IR / 750 hrs Rod
- ✅ IR range: -30°C to 500°C
- ✅ Rod range: -40°C to 125°C
- ✅ Best resolution: 0.2°C (IR), 0.1°C (Rod)
- ✅ IR accuracy: ±2°C to ±1°C depending on range
- ✅ Rod accuracy: ±0.5°C typical
- ✅ Auto-off: 3 mins standard / 15 mins in T1-T2 mode
- ✅ Field of view: 8:1
- ✅ IR response time: 0.5 seconds
- ✅ Rod response time: 20 seconds
- ✅ Emissivity: Fixed at 0.95
What’s included
Everything you need to get started with dual-temp diagnostics right away.
- ✅ Fieldpiece ST4 Dual-Temperature Meter
- ✅ 2 x K-type Wrap Tab Bead Thermocouples (ATB1)
- ✅ 2 x Velcro tie-wraps
- ✅ Clear nylon bag with magnetic hanger (ANC6)
- ✅ 9V battery (installed)
- ✅ Operator’s manual
Warranty
12 months manufacturer’s warranty included for peace of mind.
Manuals & instructions
Get up and running in minutes with the official ST4 guide.