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.

• ✅ ST4 Instruction Manual (PDF)