Multi-cycle counter system

A method of using a downhole tool activation device, wherein the downhole tool activation device comprises:

• a valve disposed between a pressurized fluid and an activation port;
• a counter device connected to the valve, wherein the valve is configured to open when the counter device has moved an activation distance in an activation direction;
• a piston engaged with the counter device, having a wellbore pressure from a fluid source applied to a first side, and a pressure in a fluid reservoir applied to a second side, the piston configured to move a step distance in a first direction when the wellbore pressure exceeds the pressure in the fluid reservoir, and configured to move the step distance in an opposite direction driven solely by a greater pressure in the fluid reservoir than the wellbore pressure;
• and
• a flow restrictor in fluid communication with the fluid reservoir and fluid source, the flow restrictor configured to delay an equalization of fluid pressure between the fluid source to the fluid reservoir and to remain in fluid communication with the fluid reservoir and fluid source before and after pressure has been equalized;
• and
• wherein the method comprises:
• increasing the wellbore pressure, causing the pressure from the fluid source to move the piston the step distance in the first direction;
• and
• lowering the wellbore pressure, causing the pressure from the fluid reservoir to move the piston the step distance in the opposite direction.