> Cheap digital clocks are likely only accurate at room temperature Gordon, The results of my rough temperature testing 6 hours @ -15C lost 8 minutes (about 1% slow) 6 hours @ +45C gained 10 seconds So there ya go. Interesting. What you say is largely true then. The typical clock is probably optimised for the habitable ambient range Made in the many many many millions I'd expect they'd all be much of a muchness Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .