Up for sale is one (1) Dwyer Instruments Series DH3 Digihelic® Differential Pressure Controller, model DH3-003, new in original box with instructions and hardware included. This is genuine factory-new old stock — the DH3 series has been discontinued by Dwyer and is no longer available through normal distribution channels, making NIB examples increasingly hard to find.

Model: DH3-003 Range: 0–0.5" w.c. (water column) Manufacturer: Dwyer Instruments, Inc. — Made in USA

This is a true 3-in-1 instrument combining a digital display gauge, two SPDT control relay switches (SP1/SP2 with adjustable deadbands), and a scalable 4–20 mA process transmitter output — all in the classic Photohelic® round gauge housing. Ideal for pressure, velocity, and flow applications including HVAC filter monitoring, duct static pressure, damper control, and fan control. Die-cast aluminum housing with backlit 4-digit LCD and front-panel programming via MENU, SP/AL, RST, and arrow keys.

Power: 12–28 VDC or 12–28 VAC Output: 4–20 mA into 900 ohms max Accuracy: ±1% full scale Connections: DB-9 style connector on rear

Item is brand new.  Box has writing from inventory tracking.
Manuals and hardware included as shown.

Ships fast from Illinois