Fieldpiece ST4 Dual-Input Temperature Meter — T1, T2 & Delta T | Type K Thermocouple
The Fieldpiece ST4 is a dual-input temperature meter designed for HVAC/R technicians who need to measure two temperatures simultaneously and calculate the difference (Delta T) between them. It displays T1, T2, and T1−T2 in large numbers on the LCD screen, making it practical for measuring temperature split across an evaporator coil, supply and return air differential, or any two-point temperature comparison in a refrigeration or air conditioning system.
Two K-type wrap-tab bead thermocouples are included. The ST4 also accepts the optional ATWB1 wet bulb thermocouple for target superheat calculations, and pipe clamp thermocouples for checking blocked dryer filters. Two front-face calibration pots allow field calibration. A magnetic hanger enables hands-free use.
Confirm all specifications — including measurement range, accuracy, and thermocouple compatibility — against the Fieldpiece ST4 manufacturer’s current datasheet before ordering.
Key Features
- Simultaneous T1 and T2 measurement with T1−T2 differential display in large LCD numbers
- Type K thermocouple input — accepts a range of K-type probes
- Superior temperature compensation for rapidly changing field environments
- Two front-face calibration pots for field calibration
- Optional ATWB1 wet bulb thermocouple for target superheat calculations
- Optional pipe clamp thermocouples for blocked dryer filter checks
- Magnetic hanger for hands-free use
- Clear front case with magnetic hanger (ANC6)
- 9V battery (installed)
- 12-month manufacturer’s warranty
What’s Included
- Fieldpiece ST4 Dual-Temperature Meter
- 2 x K-type Wrap Tab Bead Thermocouples (ATB1)
- 2 x Velcro tie-wraps
- Clear Front Nylon Bag with Magnetic Hanger (ANC6)
- 9V battery (installed)
- Operator’s manual
Best For
- HVAC/R technicians measuring temperature split across evaporator coils and air handling units
- Supply and return air temperature differential measurement
- Target superheat calculations with optional wet bulb thermocouple
- Checking blocked dryer filters with optional pipe clamp thermocouples
Check Before Ordering
- Confirm measurement range and accuracy against the Fieldpiece ST4 datasheet for your application
- Optional ATWB1 wet bulb thermocouple and pipe clamp thermocouples are sold separately — confirm availability at time of purchase
- Warranty: 12 months — confirm current terms at time of purchase
Frequently Asked Questions
Can the ST4 calculate target superheat?
With the optional ATWB1 wet bulb thermocouple, the ST4 can be used to help calculate target superheat. Confirm the ATWB1 is available and compatible before ordering.
What is the warranty?
12-month manufacturer’s warranty. Confirm current terms with HVAC Trade Supply at time of purchase.
Browse our full Fieldpiece test and measurement range or contact our team for advice.