Small, powerful, microprocessor based totalizers powered by AAA batteries have large four-digit displays and mount at the nozzle for ultimate convenience. They are suited for flow ranges from 3 to 30 GPM. Nylon® models, rated to 150 PSIG, are factory calibrated for water. Aluminum models, rated to 300 PSIG are factory calibrated for fuels. Accuracy is ±5%. All mount with 1 inch female NPT fittings.