All equipment, whatever the form of the record sheet (strip or disc), must be provided with a mark enabling the record sheet to be inserted correctly, in such a way as to ensure that the time shown by the clock and the time-marking on the record sheet correspond.
Gach trealamh, beag beann ar fhoirm an leatháin taifid (stiall nó diosca), ní mór iad a sholáthar le marc lena gcuirfear ar chumas an leatháin taifid go gcuirfear isteach i gceart é, ar bhealach lena n-áiritheofaí go gcomhfhreagraíonn an t-am a léirítear ar an gclog agus an mharcáil ama ar an leathán taifid.