Compatibility of pressure gauge with valve I have a tube with schrader valve, for which I want to buy a pressure gauge. Is there a specific type of nozzle for different types of valves?

How many types of such nozzles are available for different type of valves?

Are these nozzle types compatible with different type of valves? 

e.g. is Schrader type nozzle compatible with presta type valve?
There are Presta, and Schrader valves. There are also dunlop valves but they are far less common these days, especially in the US/UK.

Schrader and Presta are two different diameters and valve types. There are pumps that will inflate either, there are also pumps that only inflate one or the other. Many people use a pump with a built in gauge rather than carrying an independent gauge. There are however gauges that will also read both valve type, they generally have two different heads, one for each type of valve. 

Such as this one:



One side is for Presta and one is for Schrader. A presta will not work on a schrader and vise versa.