visual reading, two color meter, Red for liquid, White for air, simple ... .Specification: Weight (Kg)Weight (Kg)Equipment length L(mm)Visual reading lenth L1(mm)D-typeW-type5003503.03.26004503.23.48006503 ... .63.81,0008504.04.21,2001,0504.44.61,4001,2504.85.01,7001,5505.45.6Medium temperature ...