... , easy to operate 2.Dual line 4 digit display ,counting up or down 3.48*48mm 1.Feature ... buttons operation , easy to operate* Dual line 4 digit display ; Power fail holding function ,up to 10 years* Counting ... control output :N ,F ,C ,R ; Modulus can be set by user.* Reset modes: manual reset , auto reset ( 0 ... .1~999.9s can be set) ,external signals reset.* With 1 preset or 2 preset ...