What is the pressure scale of these manifold gauges?

Low side pressure gauge - 30-inch of Hg to 350 psiHigh side pressure gauge - 0 to 800 psi

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YELLOW JACKET Liquid Filled Manifold Gauges

YELLOW JACKET liquid-filled manifold gauges depict fluid pressure in refrigeration and HVAC systems.

Filter

Style	Model	Color	Type	Working Pressure	Price
A	49516	Blue	Low Side	30" Hg to 350 PSI	£93.25
B	49515	Red	High Side	0 to 800 PSI	£93.25

YELLOW JACKET manifold gauges are filled with glycerin to dampen vibration, mechanical shock and pressure pulsations for easy pressure readings.
They have nylon seals to avoid leakage during measurements.
The brand provides high- and low-side gauges to measure heat pump pressures & transitions in heating or cooling mode.

YELLOW JACKET 49100 Replacement Crystal: This crystal replaces the existing deformed / abrased crystal for clear observations.