The TR210 Transceiver Probe provides the ability to make two-component velocity measurements in the most difficult to access situations, particularly probe-in-flow type applications. The probe's 15 mm outer diameter, selection of multi-purpose (in-air or submerged) lenses, and fully sealed stainless steel construction make this the most compact and versatile LDV probe available. The TR210 operates in the backscatter mode, with receiving optics built in. The probe is equipped with a 60 mm focal length lens, with optional 80 mm and 120 mm focal length lenses available. The lenses are user-replaceable and require no adjustment or alignment. The TR210 probes are designed to be used with the new TSI Model EP-12 and EP-14 IC Engine Probe Adaptors