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The scubapro compact pressure gauge is a tool for monitoring how much air you have left in your cylinder when diving and also a good way to check that a dive shop hasn;t underfilled your air.
The pressure gauge hose is screwed into the high pressure port on the first stage of the regulator (at the top of the air cylinder). To check the pressure in your cylinder you read from the analogue, needle display on the instrument. The needle has a range from 0-400bar and a red zone on the dial highlights the area from 0-50bar to make it clear you are getting low on air.
The device is called compact because the presure display has a fairly small face compared to other gauges. In my opinion it has always been easy to read and is more than adequate for the purpose.
I use this as a back up gauge as I dive with a computer that has a transmitter to my tank to measure the pressure. If the watch fails or the batteries die, I can still tell what air I have left and avoid running out when I am 30m underwater.
The plastic loops at the side allow you to use d-rings or lanyards to secure the gauge in a comfortable place and stop it from dangling around in the water.
As a pressure gauge it is ideal, but a lot of people will be diving with this as their main gauge and will also want to know their depth. A lot of gauges allow an add-on of a depth gauge by attaching another unit to the pressure gauge (or a lot are supplied with both built into a single console). This model does not have any way of securing an add-on and therefore is not suited to being used as a main gauge.
The gauge is lighter than other gauges due it's smaller size, so ideal for taking with you on holiday if you prefer to use your own gear.
The gauge is well made and feels very study. As it's deigned to take up to 400bar pressure this is quite important, although you are only likley to be using a cylinder filled to about 230bar if it's carbon steel or 300bar if it is aluminium (As I'm an engineer...that is operating pressure not design pressure!)
The reinforcement of the join between the gauge and the hose makes it more hardwearing and harder to develop a leak in the hose. It also acts as quite a convienient way to hold the gauge by bulking out the hose a bit.
The attachment to the cylinder also has a protector to stop leaks and improve wear, however on mine this now slides off quite easily and can be found halfway down the hose after a dive. I think it's an easy problem to solve by pushing it harder onto the join so will not mark the product down because of that.
The pressure gauge sells for about £75. As this is an important part of your kit for checking air and is designed to hold a high pressure I think this is reasonable, however I picked mine up cheap in a dive shop from the bits and pieces bin.
Scubapro Compact Pressure Gauge. SCUBAPROs Compact Pressure Gauge is an ideal travelling gauge or back-up instrument.·400bar model adapting to 200bar and 300bar technology. Compatible with high pressure systems. ·Red zone between 50bar and 0bar for increased safety. ·Two extra loops on sides to attach safety lanyard.Number of included instruments:1Pressure gauge:YesDepth gauge:NoDigital Log:NoCompass:NoMax displayed depth:NoMax displayed pressure:400barLoop for safety lanyard:Yes-2