Radiation Alert Digital Radiation Monitor Data output and built-in timer let you document radiation activity over selected sampling periods Set timer for periods of 1 to 10 minutes in one-minute increments, 10 to 50 minutes in ten-minute increments, or 1 to 24 hours in one-hour increments—the 4-digit LCD with autoranging bar graph updates readings every three seconds. Features dual miniature jack for 0 to 5 V output. Anti-saturation circuitry holds readout at full-scale in fields up to 100 times the maximum reading. Monitor operates on one 9 V alkaline battery—order separately below.