Federation Football Rule Change 2019

The NFHS has approved the Ready for Play Timing Rule Change. Here’s how to update your Ready-Ref Timers.

Personal Timers

If your serial number is 1100001 or higher (purchased since October 2011), we will convert the timing for $20, plus $8 for return shipping.

If your serial number is lower than 1100001 (purchased before October 2011), we will replace the circuit board for $50, plus $8 for return shipping.

Our shipping address:
PO Box 2143
Marietta, OH 45750

Please send us the Personal Timer with your payment (make checks payable to “Grimm Scientific”) and we will make the conversion and send it back to you within one business day. We recommend USPS Priority Mail. If you have any questions, please call us at (800) 223-5395.

Field Clocks

Click here to learn how to convert your Field Clock system for the 2019 rule change.