Astrow Web uses counters to measure different results. Time counters(T Counters)show the time performed or missing according the rules defined. Count items (C counters) show the number of times a situation occurs according to a definition. Once defined, counters are linked with other definitions and will be displayed in daily overviews and reports (see Counters Definitions). Simple mathematical calculations to add, subtract, multiply or divide are also possible between counters (see Counters Operations).