What is it used for?

This dual-temp tool helps you measure two temperatures at the same time and shows the difference instantly. It’s perfect for checking Delta T during HVAC jobs and spotting blocked filters quickly.

Top features

• ✅ Shows T1, T2, and the difference (T1-T2) right on your meter or data logger
• ✅ Superior temperature compensation keeps your readings accurate, even when the environment shifts fast
• ✅ Works great with pipe clamps to help you check for blocked filters or performance drops
• ✅ Use wet and dry bulb thermocouples to calculate target superheat with ease
• ✅ Pair it with the EH4W kit to go fully wireless

Important specs

Reliable and accurate, the ATH4 is built for tough field conditions. Its tight temperature range and rugged build make it ideal for fast HVAC diagnostics.

• ✅ Field calibration for ±1ºF accuracy with external calibration pots
• ✅ Converts from -50ºF to 1800ºF with optional thermocouple
• ✅ Displays ºF or ºC directly with 0.1ºF resolution on your DMM
• ✅ Accepts any K-type thermocouple, not just the ones included

What's in the box?

Everything arrives ready to go – just plug in and you’re off.

• ✅ Dual-Temperature Accessory – ATH4
• ✅ (2) K-type Wrap Tab Bead Thermocouples – ATB1
• ✅ (2) Velcro tie-wraps for cable control
• ✅ Mini-calibration screwdriver for quick field tuning
• ✅ 9V battery (pre-installed)
• ✅ Easy-to-read operator’s manual

Warranty info

No stress – your tool is backed for a year, just in case.

• ✅ 1-year manufacturer’s warranty from purchase date
• ✅ Consumables like filters, batteries, and leads not included