Heat Transfer Lab Equipments Through Lagged Pipea. Diameter : 50mm150mm InnerOuter (Approx.)b. Length : 450mm (Approx.)c. Material : G.I.d Quantity : 1 No. Each.02. Measuring Instrumentsa. Digital Voltmeter Range : 0 to 300 Vb. Digital Ammeter & Range : 0 to 5 Ampsc. Digital Temperature Indicator with Selector switchRange : Ambient to 199.9 Deg. C