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.It can be easily converted from normally open to normally close by inverting the float.Note: because the current that the switch can carry is much little(0.5A), you must use a relay or contactor when it is connected by a load, relay or contactor are not included here.Product Name : Water Level Sensor;Model No. : ZP4510-S;Contacts : NO+NC;Max Contact Rating : 10WMax Switching Voltage : 100V DC;Max Switching Current : 0.5A;Max Breakdown Voltage : 220V DC;Max Carry Current : 1.0A;Max Contact Resistance : 100mTemperature Rating : -30 - +125C;Float Ball Material : SUS304;Float Body Material : SUS304;Float Ball Size(Approx) : 26 x 26mm / 1.02" x 1.02"(L*D);Thread Dia(Approx) : 9.8mm / 0.386"Bottom Clip Dia(Approx) : 14.7mm / 0.579";Hex Nut Size(Approx) : 16.6mm / 0.654";Body Total Length(Approx) : 62mm / 2.4"Cable Length : 31cm / 12.2";Color : Silver Tone;Net Weight : 39g;Package Content : 1 x Water Level SensorNote:Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.