Is this compatible with liquid filled tires? Such as tractor tires filled with calcium chloride (basically salt water).

Can be used if the liquid is at the lower side of your tractor tire. Rotate the tire so the tube stem is at the top. That's how I use it on my tractor.

Does this gauge have a push chuck or a screw on chuck connection?

It has a push on swivelling chuck. It is great and easy to use.

Is this guage designed for Presta valves?

No. The standard Schrader valve

People in the comments say "add a few drops of oil to make it hold". what oil? white mineral machine oil? where? the o-ring? valve? hollow area?

If there is an issue with the pressure holding, it is generally due to small dust particles from the valve stem, being trapped, preventing an air tight seal inside the gauge. Cleaning the spring, clear disc, and black disc will help resolve any issue with the gauge holding pressure.

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Description

🚗 Keep your ride smooth and safe with precision that glows!

BUILT TO LAST - Rugged, heavy-duty brass stem and gear-style protective guard ensure durability that stands up to any mechanic’s demands.
UNIVERSAL ACCESS - 360-degree swivel chuck provides seamless access to tire valves from any angle—no awkward positioning needed.
PRECISION YOU CAN TRUST - Certified to ANSI B40.1 standards with ±1.5% accuracy for flawless tire pressure readings every time.
EFFORTLESS PRESSURE CONTROL - Integrated air bleeder valve quickly releases excess pressure, preventing overinflation and extending tire life.
GLOW IN THE DARK VISIBILITY - Large 2" glow dial lets you check tire pressure effortlessly—even in low light or late-night roadside checks.

The JACO Elite Low Pressure Tire Gauge delivers mechanic-grade accuracy (±1.5%) certified to ANSI standards, featuring a durable brass stem, glow-in-the-dark dial, and a 360° swivel chuck for easy tire valve access. Its built-in air bleeder valve helps maintain optimal tire pressure, enhancing tire longevity and fuel efficiency—all without batteries.

Specifications

Manufacturer	JACO Superior Products
Part number	JSP-019
Item Weight	186 g
Product Dimensions	7.11 x 3.05 x 12.7 cm; 185.97 g
Item model number	JSP-019
Material	Brass
Item Package Quantity	1
Measurement Accuracy	+/- 1.5% FS
Special Features	The JACO Elite Tire Pressure Gauge helps maintain proper tire inflation with precise tire air pressure readings, while reducing uneven tire tread wear & extending tire life - features 0-15 PSI glow-in-dark scale for high visibility in dark conditions, air bleeder valve, pressure hold & reset functions, 2.25" thick brass stem, fully rotational tire chuck, and calibrated highly accurate to ANSI Grade B40.1 standards
Included components	Tire Pressure Gauge
Batteries included?	No
Batteries Required?	No

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