The oscillator calibrates an Anderon meter indication unit (e.g., ADA-15) by generating reference signals equivalent to 1, 10, and 100 Anderons for the low, medium, and high bands and outputting pseudo sine-wave signals at oscillating frequencies. The ADC-10 can be used with velocity sensors with differing sensitivities, including the ADS-12 and ADS-22, simply by switching the sensitivity.