DEVMO 1/2'' Water Flow Hall Sensor Control Switch Fluid Flow Meter Flowmeter Counter 1-30L/min Compatible with Ar-duino auspowers_batchthree And the round electrode pads

And the round electrode pads are perfect to treat pain on other small joints or flat areas

put into 2 new AA alkaline batteries

easy to find

For clear vinyl tubing

allow to connect USB flash drive

DEVMO 1/2'' Water Flow Hall Sensor Control Switch Fluid Flow Meter Flowmeter Counter 1-30L/min Compatible with Ar-duino auspowers_batchthree And the round electrode padsDEVMO 1 2'' Water Flow Hall Sensor Control Switch Fluid Flow Meter Flowmeter Counter 1 30L min Compatible with Ar duino Maximum operating current: 15mA (DC 5V)Working voltage range: DC 5~18VLoad capacity: 10mA (DC 5V)Use temperature: 80COperating humidity range: 35%~90%RH (no frost)Allowing pressure: pressure 2. 0MpaTemperature: 25 ~ +80 CExternal threads: 1 2"Outer diameter: 20mmIntake diameter: 9mmOutlet diameter: 12mmPackage included: 1pc x Water