Timers; electronic timer; digital day counter; digital hour counter; digital day and hour counter; count up timer; food freshness monitors in the nature of timers for tracking the freshness of perishable foods; food freshness monitors in the nature of counters for tracking the freshness of perishable foods; activity expiration monitors in the nature of timers for monitoring a wide variety of activities including for example exercise programs, health regimens, plant care, pet care, and laboratory experiments; activity expiration monitors in the nature of counters for monitoring a wide variety of activities including for example exercise programs, health regimens, plant care, pet care, and laboratory experiments usage trackers in the nature of timers for tracking the usage of a wide variety of products and devices including for example replaceable air and water filters, perishable organic food and beauty products, and exercise equipment; usage trackers in the nature of counters for tracking the usage of a wide variety of products and devices including for example replaceable air and water filters, perishable organic food and beauty products, and exercise equipment; chore timers