We are the chinese leading manufacturer of oxygen sensors, can offer: 1. thimble o2 sensors w/o heaters: 1 wire and 2 wire. 2. thimble o2 sensors with heaters: 3 wire and 4 wire. 3. 4 wire planar oxygen sensor. 4. Universal oxygen sensors both in thimble type and planar type. 5.German technology 6.Equipments imported from USA and semi-heaters imported from Japan. 7. We made zircunium tube ourself and have patent right. 8. passed iso/ts16949. 9. have full sets of testing equipments. Can test every technical points to guarantee the top quality products.