Always insure the validity of your hearing conservation program by checking audiometer test accuracy daily. With the portable OSCAR 6 Electro-Acoustic Ear, the operator simply places the earphones on the color-coded couplers and conducts a hearing test. The resulting data provides a permanent, legally acceptable running log to establish that the audiometer is "in calibration". The reliable OSCAR works equally well with manual, automatic and microprocessor audiometers. Portable and extremely easy to operate. Continuous power monitoring with low battery indicator light. Convenient, tool-free access for 9-Volt battery installation