eBay

Selling the pictured Keyence AP-30K Two-Color Digital Display Pressure Sensors. This listing includes the 2 Pressure Sensors -- the Main Unit NPN and Main Unit PNP -- and User Manual.

This is what the manufacturer says about this model:

AP-30 series digital air pressure sensor with unique 2-color digital display replaces conventional mechanical gauges.

Features

11-mm large, two-color LED display
Choose from four different pressure units
Fast response time of 2.5 ms
Repeatability of ± 0.2% of F.S.
Material: Front housing: Polyamide, Front panel sheet: PET, Rear housing: Polysulfone,
Pressure port: Die-cast zinc, Cable: Oil-proof cabtyre cable
Weight: 120g

Basic Specs for Main Unit NPN and Main Unit PNP:

Type	Negative pressure, NPN Negative pressure, PNP
Rated pressure	0 to -29.9 inchHg
Fluid type	Air or non-corrosive gases
Type of pressure	Gauge pressure
Display	3 1/2-digit, 2-color, 7-segment LED (Character height: 11 mm 0.43")
Display resolution	0.1 inchHg, 0.1 kPa, 1 mmHg, 0.001 bar
Detectable pressure range	-15 to +110 % of F.S.
Display temperature characteristic	±1 % max. (of F.S.) of detecting pressure at 25 °C 77 °F (0 to 50 °C 32 to 122 °F)
Response time (Chattering prevention function)	2.5/5/100/500 ms (selectable)
I/O	1 to 5 V (Load impedance: 47 kΩ min.)
I/O	NPN open collector 100 mA max. (40 V max.), Residual voltage: 1 V max. 2-output (N.O./N.C.selectable) PNP open collector 100 mA max. (40 V max.), Residual voltage: 1 V max. 2-output (N.O./N.C.selectable)
Rating	12 to 24 VDC ±10 %
Rating	50 mA (at 24 V) or less, 90 mA (at 12 V) or less
Environmental resistance	72.5 PSI
	0 to +50 °C 32 to 122 °F (No freezing)
	35 to 85 % RH (No condensation)
	10 to 55 Hz, Double amplitude 1.5 mm 0.06", 2 hours in each of the X, Y, and Z directions