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

 

M.O. Miller M3M Dual Multimeter
0 - 100v

(EQP) WBM-M3M
M.O. Miller M3M dual multimeter. One meter is 1k ohm/volt. The other meter is 150k ohm/volt. Ranges 0-10 amp, 0-100v. NSN: 6625-00-051-2786.
 
 
$145 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

Woodpecker Telephone Line Fault Detector

(EQP) WBM-L
WN Matthews and Brother Corp. Woodpecker telefault model L. Telephone line fault detector. Patented 1916, 1918. Fair condition. Includes earphone and exploring coil.
7-3/4" x 10-1/2" x 4"
 

Kelvin Bridge Ohmmeter
No. 4285

(EQP) WBM-4285
Leeds & Northrup Kelvin Bridge Ohmmeter No. 4285. Precision low resistance ohmmeter. Measures 0.0001 ohm to 26 ohms. ± 1/2%. Good condition. Includes directions. 16"x6-3/4" x 8". NSN: 6625-00-223-5730.
$295
 
$450

Universal Polyranger

(EQP) WBM-U-SP
Sensitive Research Instrument Corporation universal polyranger. Model U-SP. Measures AC and DC voltage and current. 15-1/2" x 6-1/2" x 8". Like new condition.
  • DC scales: 0.2, 2, 20, 200, 1000, 2000 milliamps. 0.005, 0.05, 0.1, 0.5, 2, 20, 200, 1000 volts.
  • AC Scales: 15, 30, 150, 300, 1500, 3000 milliamps. 0.3, 1.5, 3, 15, 30, 150, 300, 750 volts.
 

Hermach Engelhard Model C Transfer AC 7 DC Voltammeter

(EQP) WBM-C
Hermach Engelhard model C transfer AC & DC voltammeter. Measures AC, DC, volts, and amps. ± .05%. 0-1500v, 0-25A, 5-50,000 HZ. Excellent condition. Manual included.
$650
 
$895

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
 

Weston Lab Meter
10v / 20v Scales

Weston Lab Meter 10v / 20v Ranges Model 455
(MTR) 455-20VAC
Weston Lab meter, model 455 No. 2711. DC and 25-1000 cycles AC. Bakelite case with leather strap and side terminals. 5" x 7" high x 3-1/4".
  • 0 - 10v, resistance for 10v 20.3 ohms
  • 0 - 20v, resistance for 20v 40.7 ohms
$325
 
$125

Electrostatic Voltmeter
0 to 30 kv Scale

(MTR) ESH-30K
Sensitive Research electrostatic voltmeter. 0 to 30 kv scale. Model ESH, #500358. Dimensions: 10-1/4" x 11-3/4" x 8-3/4" high. Only one available.
 

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.
$795
 
*** SOLD OUT ***
 

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.
 

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.
$500
 
*** SOLD OUT ***

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

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. Dimensions: 7-1/8" x 8" x 4" high. Excellent condition except for a broken strap which is understandable since it was made in 1943!!
 

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.
$275
 
$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 Add
(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 Add
(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 Add
(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 Add
(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 Add
(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 Add
(EQP) WBM-UNI3K 0 - 3000v AC/DC Singer Meter model University. Electrostatic voltmeter.
5" square x 6" high.
225.00 Add
(EQP) WBM-311-2300 Potential Transformer Weston model 311. Ratios 2300v (3000T)
& 1150v (1500T) 115vac, 15va, 25-125 Hz.
275.00 Add
(EQP) WBM-311-460 Potential Transformer Weston model 311. Ratios 460v (600Test) &
230v (300Test) 115vac, 15va, 25-133 Hz.
225.00 Add
(EQP) WBM-931 0 - 30µA DC Weston model 931. 0 - 30 µADC.
5" wide x 3-1/2" deep x 6" high.
225.00 Add
(EQP) WBM-501 0 - 40µA AC/DC Rawson Instrument model 501. 0 - 40 µA DC or AC. 225.00 Add
(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 Add
(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 Add
(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 Add
(EQP) WBM-DC110B 1 - 0 - 1 Null CSC. model DC-110B Precision DC millivoltmeter. 1000-100mv.
Null TUM - 1.0mv
125.00 Add
(EQP) GR-728A 0 - 3/10 VDC General Radio. model 728A. DC vacuum tube voltmeter.
0 - 3 & 0 - 10 vdc scales.
175.00 Add
(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 Add
(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 Add
(EQP) WBM-341-30 0 - 15/30v AC/DC Weston model 341. 0 - 15 and 0 - 30 volt scales, 25 - 125 Hz. 75.00 Add
(EQP) WBM-501-5 0.5 - 1 - 1.5 - 2-5v AC/DC Rawson Electric model 501. 75.00 Add
(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 Add
(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 Add
(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 Add
(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 Add
(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 Add
(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 Add
(EQP) WBM-2733 Precision Potentiometer Honeywell model 2733. 0 - 101 mV & 0 - 10.1 mV 200.00 Add
(EQP) WBM-E30438-1 Precision Potentiometer Gray Instrument model E30438-1. 0 - 11 mV. 150.00 Add
(EQP) WBM-503 0 - 1 mV Rawson Electric model 503. 0 - 1 mV range.
7-1/2" square x 6" high.
175.00 Add
(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 Add
(EQP) WBM-5305 Precision Potentiometer Leeds & Northrup model 5305 Test Set. 10 - 10 Meg 175.00 Add
(EQP) WBM-786182 Precision Potentiometer Leeds & Northrup model 786182.
6" deep x 9-1/2" wide x 9" high.
195.00 Add
(EQP) WBM-8686 Precision Millivolt Potentiometer Leeds & Northrup model 8686 , w/ manual -10.1mV to 100.1 mV 395.00 Add
(EQP) WBM-2780 Precision Potentiometer Rubicon model 2780 , 0.01 - 1.6v,
10-1/2" deep x 17" long x 7" high.
295.00 Add