100% New OEM Parts Fast Shipping WELCOME TO OUR EBAY STORE climatedoctors Fieldpiece EH4W Wireless Transmitter & Receiver Kit The EH4W Wireless Handle and ET2W Wireless Transmitter connect to any Fieldpiece accessory head to easily make your accessory heads into standalone wireless instruments. Wireless signals can be sent from up to 75' away, so you can take your wet bulb measurements and have the live data in your hand while working on the condensor. SPECIFICATIONS Wireless range: Up to 75 feet (23m) line of sight Wireless Frequency: 910MHz to 920MHz (US), 868.1MHz to 868.5MHz (European) Display: 5000 count FSTN LCD Measurement Rate: 2.