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“For Good Measure”®

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Product List


Test and Measurement Instruments C.C.

          CK 1985/007464/23

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

TMI, Established—1982

English, Afrikaans, 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—2023 Test and Measurement  Instruments C.C.   |  All rights reserved

Decade Boxes

T + M ®

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T.M.I.T+M Products

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

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Brand Names



Air Quality Meters

Alcohol Breath Tester

Alignment Equipment

AM & FM Signal Generators


Appliance Testers

Audio Generators

Audio Impedance Meter


Automotive testers



Batteries for Equipment

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

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Colour Analysers

Combination Combo Meters

Concrete Testing

Conductivity  / TDS meters

Contact Tachometers

Continuity Tester

Controller / Monitors

Corner Weight Scales

Coronavirus COVID-19

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

Drain Pipe Camera

Drug Testing

Dust Monitoring

Earth resistance meter

Earth Leakage Tester, ELCB

Educational Systems

Electrical Connectors

Electromagnetic Field Testers

Electrostatic Field Tester

EMF tester

Explosives Testing

Eye Tracker

Field Strength Meters

Force gauge

Frequency Counter

Function Generators

GSM Controller

Gas leak detector

Green Hybrid Power

Grid Dip Meter

Hardness tester

Helicopter IR Gimbals

HV(High Voltage) Testing

Humidity meter


Inductance Decade Box

Infrared Thermometers

Infrared Thermography


Insulation tester

Laser Levelling

LCR meter

Leakage Clamp Meters

Logic Analyser

Logic Probes/Pulsers

Lux meter, (Light meter)


Metal Detector


Micro-Ohm Meters

Microwave Leakage

Milliohm meter


Moisture meter


Night Vision Equipment

Optical Gas Imaging OGI Thermal Cameras

ORP meter


Oxygen Meters

Pattern generators

Panel meter

PC-Based Instruments

Pen type tester

pH Meters and Probes

Pipe Inspection Camera

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

RCD, RCCB Testers

Radiation Testers


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 Cameras– Long Distance –20Kms

Thermal Imagers



Thermography Courses

Thickness Testers

Tone Generator/ Tracer

Tools - Hydraulic Crimp

Torque meter

Torque wrench

Transformer Testing

Transient Suppressors


TV & Satellite Meters

Turbidity Meter

Ultrasonic Flaw Detector

Ultrasonic Thickness

UV Corona & IR Cameras, Combined

UV light meter

Vacuum meter

Variable Transformers

Verniers, Micrometers

Vibration meter

Video Scope

Watt meter

Water Tester

Water Testing Meters

Weather Station

Vacuum/Pressure meter

Voltmeters, Bench Type

Voltage Detectors

Voltage Regulators

5 Way® Binding Posts

Voltage Stabilisers

XRF Analysers

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

T + M®                      




Time Group




Superior Electric


S.E.W. Standard Electric Works

Ph:   +27 (011) 683 4365 / 6 / 7

E-mail: sales@instrumentsgroup.co.za






Physical   Address:              

3 Angelica Ave,

Glenvista, Johannesburg, 2091



Postal Address:

As Above.

011 683 4365
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