... pre-set value, the instrument will stop feeding and counting. Self-adjusted frequency is set for checking the accuracy of circuit ... directly Frequency: f=1~2HZ f=10~20HZ Pre-set self-stop: 19999, wont count 0000 Power: 220~±20V~50HZ, capacity ... Function: adjust automatically, count at any point, pre-set stop, self-lockMain usage :test two kinds of seed:(big shape and ...