Spectroline OLK-444 pinpoints leaks in any size oil-based fluid system, including hydraulic systems, compressors, engines, gearboxes and fuel systems. The industrial leak detection kit includes the company’s Opti-Lux 400 violet-light, rechargeable LED flashlight. Its high output violet light enables dyes to fluoresce brilliantly and with greater contrast than with standard blue-light inspection lamps. The kit also includes a 16-oz. twin-neck bottle of Oil-Glo 44 concentrated oil dye, compatible with all synthetic and petroleum-based fluids, and an 8-oz. spray bottle of Glo-Away dye cleaner.