There are three types of gauge manifold / Pressure sensors to consider nowadays

Analog Manifold

Analog is the manifold of the past with dials driven directly by the pressure of the system. The advantage of analog is it’s simplicity and durability. I’ve held on to the same set of analog gauges that I started with 17 years ago. The downside to analog is they can easily b 5 PSI or more out of calibration and they are also susceptible to “needle flutter” causing inaccurate readings. This is especially critical when checking superheat and subcool where you are comparing gauge saturation to a thermometer.

Digital Manifold

Digital manifolds greatly increase accuracy and most quality brands include thermometer clamps to easily read superheat and subcool. The only considerations with digital are durability, battery life and long term accuracy. A good quality set will hold hold up for many years without requiring constant recalibration.

Wireless Probe / Sensor Systems

Some of the newest products on the market are wireless temperature and pressure sensors. These sensors then report to a phone or tablet wirelessly. The big advantage to these devices is the ability to check multiple locations at one time with no wires or hoses and the fact that less refrigerant is lost during removal because there are no hoses.  The primary downside to most sensors, is that you cannot charge or recover using them without adding in additional hoses, tees and valves.

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