Alvin T544 Hand-held Tally Counter, Record and Count instantly with This Precision Counter, Easy Action Lever Changes Count with Slight Thumb Pressure and a Single Side Knob Turn Resets Counter to Zer Record and count instantly with this precision counter Easy action lever changes count with slight thumb pressure and a single side knob turn resets counter to zero Recommended for applications where operator must be mobile, such as engineering surveys, checking meeting attendance, or taking inventory counts Four-digit register records up to 9999