... is used to check many kinds of electricity meter. With small size, light weight, strong function, it is the best tool ... or active, reactive errors of a multifunction meter, also can calibrate watthour meter and varhour meter. 7. Output electric energy constant can be ... 001H, Accuracy: ±0.01Hz. 7. Input electric energy pulse: TTL level, max. frequency ≤ 2MHZ. 8. Output electric energy pulse: rated range ...