Lab Standards & Instruments: Wood Box Meters

Panel Mount
Thermocoupler Pyrometer
(EQP) 53-5004-6002
API Instruments Co. panel mount thermocoupler pyrometer. -200º to +100º fahrenheit. -150º to 70º centigrade. Requires 10 ohm thermostat (not included). 5 amp contacts. 4-5/8" x 4-5/8" x 5-1/2" behind panel depth.
 

Micro-Potentiometer Indicator
(EQP) GRYE-3067
Gray Instrument Company micro-potentiometer indicator. Model 3067. 9" x 17-7/8" x 8-3/8". This is a very late model. NSN: 6695-00-769-5696.
$150 each
 
$950 each

Micro-Potentiometer Calibrator
(EQP) HAL-LMC
Gray Instrument Company. Hallmark Instruments micro-potentiometer calibrator. 9" x 16-1/2" x 8-1/4".
 

Model 2680 Potentiometer
(EQP) WBM2680
Rubicon Instruments Minneapolis Honeywell Model 2680 potentiometer. 10-1/2" x 17-1/4" x 7".
$250 each
 
$250 each

Weston AC & DC Wattmeter
50v, 100v & 200v Ranges
(MTR) 310-WATT
Weston AC & DC wattmeter. 50v, 100v & 200v ranges. 250 watts. Includes reversing switch to reverse polarity. 0 - 1200 Hz. Made in 1965. Like new condition.
 

Weston AC & DC Ammeter
0.5 amp Range
(MTR) 370-8443
Weston AC & DC ammeter. 0.5 & 1 amp. 0.5 amp range = series connection, 7.4 ohm, 0.144 Henry self-inductance. 1 amp range = multiple connection, 2.4 ohm, 0.0036 Henry self-inductance. Made in 1950. Like new condition.
$695
 
$395

Weston Model 370
Wood Box Lab Instrument
(MTR) WBM-370
Weston Model 370 wood box lab instrument. Measures absolute amps. Magnetically shielded electro-dynamometer ammeter. 0 - 10 or 0 - 20 amps AC or DC. Dimensions: 8-1/2" x 10-1/2" x 5-3/4". Made in 1956.
 

G.E. Portable AC Ammeter
0 - 1 amp / 0 - 2 amp

(MTR) 8AP9AAT6
General Electric portable AC ammeter. 0 - 1 amp, 0 - 2 amp. 1/100th amp resolution. Rugged, bakelite case with hinged lid. 1950's vintage.
$485
 
$95

Fluxmeter
(MTR) WBM-FM
Sensitive Research Instrument Corp. Model FM Fluxmeter. Sensitivity = 10,000 maxwells per division when using a single turn coil. 50,000,000 maxwells full scale. 7-3/4" x 7-3/4" x 6-1/2" high. Made in 1960. New condition!!
 

Kilowatt Meter
0 - 7.5 / 0 - 15

(EQP) 21061
Weston kilowatt meter. 0 - 7.5 / 0 - 15 ranges. Leather strap. Black, bakelite case. 3-1/4" x 5" x 5-1/4" high.

• 0 - 7.5, max volts = 200, 11371 ohms,
0.75 max amps
• 0 - 15, max volts = 400, 22742 ohms,
0.50 rated amps
$350
 
$325

Electrostatic Voltmeter
Switchable to 3 Scales: 10 kv, 25 kv, 50 kv
(MTR) ESH/SINGER
Singer electrostatic voltmeter. Switchable to 3 scales: 10 kv, 25 kv, 50 kv. 13" x 24" x 14". Tested, works great.
 

Standard Resistor
1k Ohm
(EQP) GR-1440-9631
General Radio 1k ohm standard resistor. Initial deviation individually measured and marked. 30 ma max. Gold plated terminals.
*** SOLD OUT ***
 
 
$45 each

General Electric Transfer Switch
Bridging Type

(MTR) 8947963G1
General Electric transfer switch. 10 position. Bridging type. Coin gold contacts. 8" square x 3-1/2" high.
 

Rawson Model 518
Electrostatic voltmeter available in various ranges. Solid wood cabinet is 8-1/2" deep, 9-1/2" wide and 6" high.
$500
 
See Pricing Chart below
 

Potentiometers
Leeds and Northrup, Rubicon and others manufactured these potentiometers all in gorgeous wood cabinets. Made from 1920-1960, some of these precision laboratory instruments are still currently in use. The majority of our stock originated at the Los Alamos National Lab. Many of the instruments in our inventory do not have model numbers so they are difficult to identify. Most prices range from $200-$500.
 

Sensitive Research
Model "S"

Micro ammeters, milli voltmeters, in Model S with beautiful solid wood cabinet. 7-1/2" square, 4-1/2" high. All in new or very good condition.
See Pricing Chart below
 
 
See Pricing Chart below
 

150 Ohm Movement
(EQP) WBM-M3M
Miller meter dual multimeter. Meter #1 is 150k ohm/V with a range of 0.2 - 20v. Meter #2 is 1k Ohm/V with a range of 2mv-100v. 10" x 11" x 5-1/2" high.

AC & DC Current Ranges
• 1 ma, 500 ma
• 5 ma, 1 amp
• 10 ma, 5 amp
• 50 ma, 10 amp
• 100 ma

AC & DC Volt Ranges
• 1 mv, 100 mv
• 5 mv, 1 v
• 10 mv, 5 v
• 50 mv, 50 amp

  

Westinghouse Dual Scale Meter
0-50 mv / 0-150 mv
(EQP) WBM-WG.42753-1
Westinghouse dual scale meter. 0 - 50 mv, 0 - 150 mv. Bakelite case. Perfect addition to almost any shunt with 50 mv output. Dimensons: 7-1/8" x 8" x 4" high.

Excellent condition except for a broken strap which is understandable since it was made in 1943!!
$145
 
$275

Electrostatic Kilovolt Meter
2 inputs: 750 vac or vdc / 3000 vac Only
(EQP) U23952
Sensitive Research electrostatic kilovolt meter. 2 inputs: 750 vac or vdc, 3000 vac only. Leather strap. Black, bakelite case. 4-1/2" x 5-1/4" x 5-1/2" high. Excellent condition.
 

Watt Meter
75v & 150v Ranges
(EQP) 101434
Sensitive Research watt meter. 75v & 150v ranges. Side terminals. 0 - 7.5, 0 - 15, 0 - 30 watt scales. Leather strap. Black, bakelite case. 4-1/2" x 5" x 5-1/4" high. Excellent condition.
$325
 
$375
 

Weston DC Voltmeter
3 Inputs: 150, 300 or 750 vdc

(MTR) 931
Weston DC voltmeter. 3 inputs via binding posts: 150, 300 or 750 vdc. 5" x 6" high x 3" deep.
 
 
$149 each
 
Lab Standards & Instruments Listed
 
Part Number
Description
Price
  
(EQP) WBM-ESD300 0 - 300v AC/DC Sensitive Research model ESD. Electrostatic voltmeter.
7-1/2" deep x 10" wide x 6-1/2" high.
175.00
(EQP) WBM-ESD500
0 - 500v AC/DC Sensitive Res. model ESD. Electrostatic voltmeter. AC to 1 MHz
7-1/2" deep x 10" wide x 6-1/2" high.
199.00
(EQP) WBM-518-500
0 - 500v AC/DC Rawson Elec. Instr. model 518. Electrostatic voltmeter.
8-1/2" deep x 9-1/2" wide x 6" high. NOTE: Not working.
50.00
(EQP) WBM-518-1K
0 - 1000v AC/DC Rawson Elec. Instr. model 518. Electrostatic voltmeter.
8-1/2" deep x 9-1/2" wide x 6" high.
225.00
(EQP) WBM-518-2K
0 - 2000v AC/DC Rawson Elec. Instr. model 518. Electrostatic voltmeter.
8-1/2" deep x 9-1/2" wide x 6" high.
255.00
(EQP) WBM-ESD2K
0 - 2000v AC/DC Sensitive Res. model ESD. Electrostatic voltmeter. No lid.
7-1/2" deep x 10" wide x 6-1/2" high
295.00
(EQP) WBM-UNI3K
0 - 3000v AC/DC Singer Meter model University. Electrostatic voltmeter.
5" square x 6" high.
225.00
(EQP) WBM-80E-10
Voltage Divider John Fluke model 80E-10. Range 10 - 0 - 10.
10 kv maximum voltage.
225.00
(EQP) WBM-311-2300
Potential Transformer Weston model 311. Ratios 2300v (3000T)
& 1150v (1500T) 115vac, 15va, 25-125 Hz.
275.00
(EQP) WBM-311-460
Potential Transformer Weston model 311. Ratios 460v (600Test) &
230v (300Test) 115vac, 15va, 25-133 Hz.
225.00
(EQP) WBM-931
0 - 30µA DC Weston model 931. 0 - 30 µADC.
5" wide x 3-1/2" deep x 6" high.
225.00
(EQP) WBM-501
0 - 40µA AC/DC Rawson Instrument model 501. 0 - 40 µA DC or AC.
225.00
(EQP) WBM-S400
4 - 40 - 400 µA DC Sensitive Res. model S. 0 - 4 µA, 0 - 40µA
& 0 - 400µA scales. 7-1/2" square x 4-1/2" high.
325.00
(EQP) WBM-HDC-B
0.05 - 0.1 - 0.5 - 1 - 5 - 10 - 50 - 100ma DC Hallmark Standards model HDC-B.
0 - 0.05 mA + 0.1, 0.5, 1, 5, 10, 50 & 100 mADC ranges
225.00
(EQP) WBM-326
0 - 2.5 & 5 amps AC/DC Weston model 326. 0 - 2.5 amps & 0 - 5 amps AC or DC. Lab Standard. 15" square x 6" high.
350.00
(EQP) WBM-DC110B
1 - 0 - 1 Null CSC. model DC-110B Precision DC millivoltmeter. 1000-100mv.
Null TUM - 1.0mv
125.00
(EQP) GR-728A
0 - 3/10 VDC General Radio. model 728A. DC vacuum tube voltmeter.
0 - 3 & 0 - 10 vdc scales.
175.00
(EQP) WBM-D-1K
10 - 30 - 100 - 300 - 1kv AC/DC Sensitive Res. model D. Dynamometer.
8" square x 6-1/2" high.
150.00
(EQP) WBM-D-300
5 - 10 - 30 - 100 - 300v AC/DC Sensitive Res. model D. Dynamometer.
8" square x 6-1/2" high.
125.00
(EQP) WBM-341-30
0 - 15/30v AC/DC Weston model 341. 0 - 15 and 0 - 30 volt scales, 25 - 125 Hz.
75.00
(EQP) WBM-501-5
0.5 - 1 - 1.5 - 2-5v AC/DC Rawson Electric model 501.
75.00
(EQP) WBM-GSP
1.5 - 750 DCV, 7.5 ma - 3DCA in 18 ranges Electronic Instr.
Model GSP multimeter. 200/V. 8" square x 4-3/4"H.
200.00
(EQP) WBM-512D
2 - 5 - 10 - 20 - 50 - 100 - 200-500 ranges in DCmA, DCV, ACmA, ACV Rawson Model 512D multimeter. 9" square.
200.00
(EQP) WBM-C2
1-1kvDC, 10ma-10DCA in 14 ranges Sensitive Research model C-2 multimeter.
7-1/2" square x 4-1/2" high
250.00
(EQP) WBM-1-100
0.01 - 0.1 - 1 - 10 - 100 DCV, 10 / 100 DCA Weston model 1, no cover,
multimeter. 8" wide x 9-1/2" deep x 3-1/2" high
125.00
(EQP) WBM-622
1.5 - 750 DCV, 7.5 ma - 3DCA in 18 ranges Weston model 622 multimeter.
8" wide x 7-1/2" deep x 3" high
200.00
(EQP) WBM-425AR
10µV - 1v and 0.003 - 3 mADC in 18 ranges HP model 425AR. 10, 30,
100µV / 0.3, 1, 3, 10, 30mV / 0.1, 0.3, 1V / 0.003, 0.01, 0.03, 0.1, 0.3, 1, 3 maDC
250.00
(EQP) WBM-2733
Precision Potentiometer Honeywell model 2733. 0 - 101 mV & 0 - 10.1 mV
200.00
(EQP) WBM-E30438-1
Precision Potentiometer Gray Instrument model E30438-1. 0 - 11 mV.
150.00
(EQP) WBM-503
0 - 1 mV Rawson Electric model 503. 0 - 1 mV range.
7-1/2" square x 6" high.
175.00
(EQP) WBM-S100
0 - 50 / 0 - 100 mVDC Sensitive Res. model S. 0 - 50 millivolt DC, 0 - 100mVDC.
7-1/2" square x 4-1/2" high.
225.00
(EQP) WBM-5305
Precision Potentiometer Leeds & Northrup model 5305 Test Set. 10 - 10 Meg
175.00
(EQP) WBM-786182
Precision Potentiometer Leeds & Northrup model 786182.
6" deep x 9-1/2" wide x 9" high.
195.00
(EQP) WBM-8686
Precision Millivolt Potentiometer Leeds & Northrup model 8686 , w/ manual -10.1mV to 100.1 mV
395.00
(EQP) WBM-2780
Precision Potentiometer Rubicon model 2780 , 0.01 - 1.6v,
10-1/2" deep x 17" long x 7" high.
295.00
 
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