Yes. Samayik is one muhurt (48 minutes). If you do not have a ghadi/hourglass, you may use a phone timer, provided it does not create distraction or attachment.

Simple guidelines to keep it proper:

• Set the timer to 48:00 before beginning. Do not touch the phone once samayik starts.
• Keep the phone on silent or airplane mode. Use a soft bell or single vibration at the end only.
• Place it face down and away from you to avoid light and notifications.
• Avoid checking time during samayik; rely only on the final alert.
• Treat it purely as a time-measuring aid, not for any other use.

Both Shvetambar and Digambar traditions define samayik as one muhurt (48 minutes). Using a non-distracting timing aid to preserve punctuality is acceptable; inner discipline and steadiness of upayog are foremost. If possible later, prefer a simple ghadi/hourglass, but until then a carefully-silenced phone timer is fine.