The Traceable Ultra-Low Flowmeter from Control Co., Friendswood, TX, is a compact, fully contained device with ±2% F.S. accuracy for liquid temperatures of 20°C–30°C. Otherwise accuracy is ±4% F.S. Features include 4-button operation (flow/total, units, zero, and power), an LCD, and display of current flow and total accumulated flow. You can use the flowmeter with fluid temperatures from 0°C–50° and you can adjust the viscosity compensation correction. It is 6 5/8 by 4 3/4 by 4 1/2 in., weighs 1 lb., operates for up to 6 months on a car battery, and is supplied with an individually numbered certificate traceable to NIST standards.