David Brown Vintage Tractor Meters are used to determine rotational speed of disk, shaft and wheel of aircraft and automobiles. Offered products are also used to measure injected lubrication oil pressure fed into IC machine. These instruments consist of calibrated analog dial that exhibits operating speed in rpm unit. These use Fahrenheit scale, although these are compatible with other temperature measurement units for determining low and high temperature. Simple to operate, David Brown Vintage Tractor Meters are available with durable housing part. Provided tractor meters adopt ammeter to evaluate precise flow of current supplied to vehicle battery. These are available in 52 mm size.