You are buying one Samson MC8 365804 Std Flow Mechanical Oil-Coolant Meter w-Straight Flex Spout
New, open box item. See photos. 

From the Manufacturer:

Fluids Handled

 

• Extensively and rigorously field tested. Reliable performance.
• No calibration required. High accuracy within a large viscosity range.
• One piece polycarbonate based integral register housing and single molded pointer knob guarantee maximum integrity of the meter against drops and impacts and provide superb protection against humidity.
• Fully mechanical register.
• Simple and easy to read dial includes 5-digit totalizer
• Very tough metal construction, the meter is ideal for intensive use and outdoor applications.
• The MC8 uses the CV11 SERIES control handle. This handle is flange coupled to eliminate the use of adapters and eliminate leaks.

Maximum Free Flow Rate

8 gal/min (30 l/min)

Maximum Working Pressure

1,450 psi (100 bar)

Fluid Inlet

1/2" NPTF

Fluid Outlet

1/2" NPTF

Accuracy

+/- 0.65%

Power Source