Meters
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Meters: Frequency Determining

50 Hz Only Meter
(MTR) 31-FX50
JBT reed type frequency meter indicates cycles/sec from 48-52 Hz in 1 Hz steps. 3-1/2" diameter face.
 

Frequency Meter
(MTR) MMI-10628
General Electric giant nuclear electronic frequency meter indicates 55 - 65 Hz. 4-3/4" wide x 4-3/8" high face. 4" behind panel. Fits 4" hole.
$90 each - $82 (3+)
 
$345 each

Frequency Meter
39 - 41 Hz
(MTR) 15-FH56Y13R
JBT frequency meter. 39 - 41 Hz. 10 vac. 1-1/2" hole required. 2" diameter bezel. 2" behind panel depth. Scaled.
 

Frequency Meter
47 - 53 Hz / 57 - 63 Hz
(MTR) 30-FHXX-14
JBT reed type frequency meter indicates cycles per second both from 47 - 53 Hz and 57 - 63 Hz. 50/60 Hz. 3-1/2" diameter. Fits 2-3/4" hole. 2-7/8" deep.
$85 each
 
$165 each

AC Frequency Meter
(MTR) 410-05498
Varo panel meter scale reads 340 - 440 Hz / 390 - 404 Hz. 4-1/2" diameter face. Fits 3-1/2" hole.
 

Frequency Meter
(MTR) 13217E3785
A&M sealed meter for use with external transducer. Scale: "388 - 412 Hz". Actual full scale = 100 µa. 3-1/2" diameter face. Fits 2-3/4" hole.
$225 each
 
$45 each

Frequency Meter
50 - 70 Hz
(MTR) 566900
Electronic type frequency meter indicates cycles per second from 50 - 70 Hz. 3-1/2" diameter face. Fits 2-3/4" hole. 3-3/8" deep.
 

Meter / Transducer
400 Hz
(MTR) 400HZ
Mil-spec 380-420 Hz system includes separate transducer (631-16394) and Phaostron 3-1/2" meter (20690D1). Meter is 200 µADC full scale.
$190 each
 
$500 each