Perhaps, but for another £100 I have a full programmable progressive controller, with a low level indicator and fault indicating LED.
From testing on mine, I've found it runs better when used progressively to start pumping at 7psi ramping up to full pump by 15psi.
Giving it full pump at anything below 12psi seems to cause a minor hesitation as it doesn't need that much fluid yet, reducing nozzle size to counter this means it hasn't got enough at the top end to cool to it's full ability.