| PartNumber | MK21-1A66B-500W | MK21-1A71B-500W | MK21-1A66C-500W |
| Description | Proximity Sensors 1 Form A Screw Mt AT 1015 Wire Term | Reed Senso | Proximity Sensors 1 Form A Screw Mt AT 1520 Wire Term |
| Manufacturer | Standex Electronics | - | - |
| Product Category | Proximity Sensors | - | - |
| RoHS | Y | - | - |
| Sensing Method | Magnetic | - | - |
| Mounting Style | Screw | - | - |
| Maximum Operating Temperature | + 150 C | - | - |
| Minimum Operating Temperature | - 20 C | - | - |
| Series | MK21 | - | - |
| Brand | MEDER electronic (Standex) | - | - |
| Operating Supply Current | 500 mA | - | - |
| Operating Supply Voltage | 200 V | - | - |
| Factory Pack Quantity | 50 | - | - |