Water Level Sensor Float Switch Polyimide You can use the multimeter

You can use the multimeter to measure DC and AC voltage

1 °C in still air

The Diameter of this IR Receiver LED is 5mm

These are Metal Film Resistor with a value of 3k ohm 1/4W and tolerance of ±1%

Water Level Sensor Float Switch Polyimide You can use the multimeterA float switch is a device used to sense the level of liquid within a tank, it may actuate a pump, an indicator, an alarm, or other device. A float switch is a device used to sense the level of liquid within a tank. The switch may actuate a pump, an indicator, an alarm, or other device. Use them with hydroponics, saltwater tank, freshwater tank, gardening, aquariums for power head control, pet bowls, fish tanks, filtration, heating, pumps, ponds,