Students use the manifold gauges to measure pressure and determine the saturated temperature of the refrigerant. They take numerous notes to record their findings<

Students work in teams and discuss their results.	The instructor watches while the student checks the fittings on the manifold set.
The refrigerator has a grounded circuit; the plug has the ground so the students must find that wire...which requires thoroughly inspecting the unit.
A student checks the end of the plug for grounds and shorts before turning on the power