What is the outer diameter of the threaded part, and will this sensor work with water?

Yes, it will work with water. I believe the outer diameter is 1/4" male NPT thread. That said, you can always use a bushing to adapt it to whatever you are screwing it into (e.g. make it work with a 3/8" NPT female fitting).

I want to use this for a lab experimental procedure: will I be able to retrieve the pressure data in real time?

That depends on what you mean by "real time." It outputs an analog voltage that is a linear slope ranging from 0.5 volts (or close to that) for 0 Psi up to 4.5 volts (or close to that) for the upper range of Psi per sensor (150 Psi for the one I purchased). I assume there is some minimal latency for the analog circuitry inside the sensor to convert mechanical energy to electrical energy, but on your end, as I'm doing, you'll need to use an ADC (analog to digital converter) to process the data digitally, which has its own set of latencies depending on processing speed, bit resolution, etc. For my purposes, it's close enough to real time since I'm using an arduino board with my main loop time of less than 20 milliseconds with several of these sensors, and other sensors.

ASIN	B00NIK98O8
Best Sellers Rank	#263,594 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #151 in Pressure Probes & Sensors
Brand	AUTEX
Brand Name	AUTEX
Customer Reviews	4.2 out of 5 stars 250 Reviews
Manufacturer	AUTEX
Material	Stainless Steel
Material Type	Stainless Steel
Maximum Supply Voltage	5 Volts (DC)
Measurement Accuracy	±1.5 psi
Model Number	GSND-0556629788
Mounting Type	Flange Mount
Output Type	electrical signal
Response Time	1 Milliseconds
Specific Uses For Product	Industrial
Style	Industrial
Style Name	Industrial
UPC	702373916802
Upper Temperature Rating	125 Degrees Celsius

AUTEX 150 Psi Pressure Transducer/Sender/Sensor 150/200 Psi Stainless Steel 1/8ââ‚¬Â-27 NPT Pressure Transducer Sensor Compatible With Oil, Fuel, Air, Water

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