A Leading South African Test and Measurement Instruments Supplier

“For Good Measure”®

Please contact us by phone, fax, email or visit us at the details given above. We look forward to hearing from you.

Product List


Test and Measurement Instruments C.C.

          CK 1985/007464/23

“Tomorrow’s Instruments Today”  —  “For Good Measure” ®

TMI, Established—1982

TMI Tester

English, Afrikaans and Portuguese   Speaking

Master/Visa Credit Cards

Decade Boxes

Decade Boxes

Part No:  LBOX-405

Inductance Box, 10uH to 111mH, 10uH per step in 4 Decades.

Lutron Instruments LBOX-405 Inductance Decade Box

Part No:  RBOX-408

Resistance,  1 to 11,111,110 Ohm, 1 Ohm steps in 7 Decades

Lutron Instruments RBOX-408 Resistance Decade Box



Lutron Instruments RBOX-408 Resistance Decade BoxLutron Instruments LBOX-405 Inductance Decade Box

Part No:  CBOX-406

Capacitance, 100pF to 11,111uF 100pF steps in 5 Decades

Lutron Instruments Capacitance Decade Box


Lutron Instruments Capacitance Decade BoxLutron Instruments LBOX-405 Inductance Decade BoxLutron Instruments RBOX-408 Resistance Decade BoxLutron Instruments Capacitance Decade Box

Notes on Decade Boxes.

Decade boxes and dividers provide highly accurate and digitally variable standard values of resistance, capacitance, inductance, voltage and/or current for calibration, comparison and testing. Decade boxes and dividers include decade inductors, decade resistors, decade capacitors, voltage dividers and precision potentiometers. Automated test equipment (ATE), electrical testing instruments and other specialized electronic test systems often use decade boxes and dividers as precision components. Voltage dividers and Kelvin-Varley dividers or potentiometers provide a ratio of voltage or current for use as a reference. Transfer, primary, and laboratory grade standards are used to compare or transfer accuracies from the National Institute of Standards and Technology (NIST) or other nationally certified organizations to working decade boxes and dividers. Typically, these working devices are robust or rugged units for production or in-line testing and calibration. 

There are several types of decade boxes and dividers. Standards are devices that usually consist of a single, fixed value component or several components not in the same circuit. Standards with more than one component (e.g., several fixed value resistors) have multiple posts or a rotary switch for selecting different resistance values. Substituters, another type of device, usually consist of multiple components. Varying the number of resistors in series or parallel sets the standard resistance value for the circuit. Voltage dividers are digital potentiometers that provide a highly accurate ratio (Vout / Vin) of voltage and current for calibration and testing. Kelvin-Varley voltage dividers consist of a bridge circuit with two standard value resistors. RTD simulators provide an output to simulate an RTD resistance value for the calibration and testing of resistance temperature detectors. Thermocouple simulators output a precise voltage.

Decade boxes and dividers are available with a variety of features. Some devices are suitable for alternating current (AC) or direct current (DC) calibration and testing applications. Other devices are designed for use in larger systems or products, or can perform precision measurements. Rack mounted, stand-alone, and benchtop devices are often available. Low zero or residual decade boxes and dividers have low values of zero, offset or residual impedance resistance, inductance or capacitance. Variable decade boxes and dividers can provide a precise and continuously variable value such as a variable capacitor or potentiometer. Devices are also available with a computer interface option for programming, control, or data acquisition.

Test and Measurement Instruments C.C. T+M Instruments

Copyright  © 2009—2018 Test and Measurement  Instruments C.C.   |  All rights reserved

Decade Boxes

T + M ®


TMI divide lineTMI divide lineTMI divide lineTMI divide lineT+M InstrumentTest and Measurement Instruments C.C.T.M.I. T+M
Lutron Instrument ElektroPhysik EZ Digital Fluke InstrumentT + M Yokogawa Instruments TMI InstrumentsSA Flag on TMI site
Promax Electronics

Clearance Sale:

Excess Stock to be cleared while stocks last. >   Click for More...

Flir Infrared ThermometryTime Group High Time TechnologyLodestar Electronics Acute PC-Based Instruments from Test andMeasurement Instruments C.C.Intercomp "For any Measure"MSR ElectronicsSuperior Electric Powerstatk and h educationalT.M.I.T+M Products

T + M ®


SEW Instruments

DECADE BOXES for INDUCTANCE, CAPACITANCE and RESISTANCE. Ideal for use in schools and other educational institutes and Research and Development (R&D).

Test our Service and           

Measure with our                 


FaceBook TMITwitter TMI
Test and Measurement Instruments Africa.TMI Pagerank
index sitemap advanced

Brand Names



Air Quality Meters

Alcohol Breath Tester

Alignment Equipment

AM & FM Signal Generators


Audio Generators

Audio Impedance Meter

Automotive testers



Battery Analyser /

Battery Desulphator Charger

Bench DMM’s


Bread Boards

Breath  Alcohol Tester

Cable Fault Locators

Cable Height Meter

Cable Testers


Capacitance meters

Carbon Dioxide meters

Carbon Monoxide meters

Car Testers

Caster / Camber Gauges

Chlorine Meter

Clamp meters

Clearance Sale:

Colour Analysers

Combination Combo Meters

Concrete Testing

Conductivity  / TDS meters

Contact Tachometers

Continuity Tester

Controller / Monitors

Corner Weight Scales

Current Meters, Bench Type

Data Acquisition Systems

Data Loggers

Decade Boxes

Dew Point Meters

Digital Vernier Calipers

Digital Scales

Digital Multimeters , DMMs

Dissolved Oxygen Meters

Distance Meters

Dust Monitoring

Earth resistance meter

Educational Systems

Electrical Connectors

EMF tester

Eye Tracker

Field Strength Meters

Force gauge

Frequency Counter

Function Generators

GSM Controller

Gas leak detector

Green Hybrid Power

Grid Dip Meter

Hardness tester

HV(High Voltage) Testing

Humidity meter


Inductance Decade Box

Infrared Thermometers

Infrared Thermography


Insulation tester

LCR meter

Leakage Clamp Meters

Logic Analyser

Logic Probes/Pulsers

Lux meter, (Light meter)


Metal Detector


Microwave Leakage

Milliohm meter


Moisture meter


Night Vision Equipment

ORP meter


Oxygen Meters

Pattern generators

Panel meter

PC-Based Instruments

Pen type tester

pH Meters and Probes

Photo Tachometer

Power analyzer

Power clamp meter

Power Supplies

Pressure/Vacuum meter

3 Phase Rotation Tester

Pressure Transducer

Probes, Oscilloscope

Protection Relay Testing

Proximity sensor

Racing Equipment

RCCB tester


Renewable Energy

RF Generators

Resistance Decade Box

Roughness tester


Salt meter

Satellite Testing Equipment


Scales, Digital

Shore Hardness Tester


Soil Moisture Meters

Soil pH meter

Solar Power Meter


Sound level meter

Spectrum Analyser


Student Bench Meters

Stun Guns

SWR / RF Power Meters


TDS / Conductivity Meters

Test Leads

Thermal Imagers



Thermography Courses

Thickness Testers

Tone Generator/ Tracer

Torque meter

Torque wrench

Transformer Testing

Transient Suppressors


TV & Satellite Meters

Turbidity Meter

Ultrasonic Flaw Detector

Ultrasonic Thickness

UV light meter

Vacuum meter

Variable Transformers

Verniers, Micrometers

Vibration meter

Video Scope

Watt meter

Water Tester

Water Testing Meters

Vacuum/Pressure meter

Voltmeters, Bench Type

Voltage Detectors

Voltage Regulators

5 Way® Binding Posts

Voltage Stabilisers

T + M®                      




Time Group


S.E.W. Standard Electric Works

MSR Electronics

Superior Electric


All brands, trade names, trade marks, and logos are the property of their respective owners.

30th anniversay of Test and Measurement Instruments c.c.

Ph:           +27 (011) 683 4365

Fax:          +27 (011) 683 4461

E-mail:     t.m.i@iafrica.com



NEW  Address:

(from 6 January 2016)

Physical   Address:              

3 Angelica Ave,

Glenvista, Johannesburg, 2091



Postal Address:

P.O. Box 1416,


Johannesburg, 2135,


TMI Monthly Specials

This Month’s Special

Thermography—Thermal Imager— Infrared Camera.

FLIR E5 (120 x 90 Pixels)


R 21,150.00 + VAT

while stocks last. 


FREE Thermography

Introductory Course

Included with Lunch.


One Day Course.

Click  Ex-Series  for Spec.

Also: Thermal Imagers

FLIR E4 Thermal Camera