This listing is for a single E3T-FT21 through-beam photoelectric sensor offered as a replacement-style unit. Reference sources describe the model as a through-beam sensor with a nominal sensing distance of 300 mm and an NPN output (light-ON). The sensor is an ultrathin, compact design suitable for space-constrained installations.

• Through-beam detection with nominal sensing distance of 300 mm (supplier references list 300 mm as the sensing range).
• Compact ultrathin body – scraped dimensions approximately 7 x 9.5 x 14.6 mm (estimate); check manufacturer datasheet for exact mounting and clearance.