ROLS-W Sensor, Measurable Speed - Maximum 250,000 RPM, Measurable Temperature - Maximum 158 Degrees F, Measurable Temperature - Minimum 14 Degrees F, Product Type Optical Sensor, Sensing Distance - Maximum 25 ft, Overall Length 18 in, Overall Height 0.71 in, Overall Width 0.71 in, Compatible Product Type Stroboscopes, Tachometers, Includes 8 ft Cable, Tinned Leads, Features Visible Red Light Source, Material Stainless Steel, Standards CFR 1040.10 and 1040.11, IEC60825-1 Ed. 3 and 21