CM-1 Direct-Reading Capacity Meter.

Read value directly on 4 1/2" meter with linear scale calibrated in mfd. and Pf ranges:
0-100 Pf, 1000 Pf, 0.01 mfd., and 0.1 mfd full scale. Not susceptible
to hand capacity effects.

Ranges: 0 to 100 mmf., 1000 mmf., 0.01 mfd. and 0.1 mfd. full scale

Calibrating condensers: ± 1% for 100 and 1000 mmf. ranges; ± 2% for 0.01 and 0.1 mfd. ranges

Tubes: 6BX7GT oscillator, 6X5GT rectifier, OA2 voltage regulator

Meter: 50 microampere movement

Power requirements: 105-125 volts AC, 50-60 cycles, 25 watts

Dimensions: 7-3/8" high x 4-11/16" wide x 4-1/8" deep

7 lbs.
1957 price:  $29.50.