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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

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Verniers & Micrometers

Verniers, Micrometers

Part No:  DC-516

Digital Micrometer, 25mm x 0.001mm,1” x 0.00005”        mm/inch Select, Zero Button

Lutron DC-516 Micrometer


Lutron DC-516 Micrometer

Notes on Calipers.

Calipers typically use a precise slide movement for inside, outside, depth or step measurements. Specialized slide type calipers are available for center, depth and gear tooth measurement and gaging machine table travel.  Some caliper types such as spring / fay or firm joint calipers do not usually have a graduated scale or display and are used for comparing or transferring dimensions.

Common types of calipers include center measuring, gear tooth, machine travel, nib jaws, pocket or rolling mill, slide caliper, and spring or firm-joint.  A center measuring caliper has conically pointed jaws designed to measure the distance between the centers of two holes.  A gear tooth caliper has an adjustable tongue designed to measure the thickness of gear teeth at the pitch line.  The adjustable tongue sets the measurement depth at the pitch line or addendum.  Machine travel calipers are designed to measure the travel or position changes of a machine bed, table, or stage.  These gages are typically mounted on a machine or are built into a product including machine tools, microscopes, and other instruments requiring precision dimensional measurement or position control.  Nib shaped jaws facilitate measurement of inside features (ID), outside features (OD), grooves, slots, keyways or notches. Compared to the blade edge typically found on standard calipers, the nib is more easily and accurately located on an edge or groove.  Small, pocket-sized calipers are usually designed for low precision gaging applications.  Rolling mill calipers are usually simple rugged devices for quick gaging of stock in production environments.  Sliding calipers use a precise slide movement for inside, outside, depth or step measurements. While calipers do not typically provide the precision of micrometers, they provide a versatile and broad range of measurement capability: inside (ID), outside (OD), depth, step, thickness and length.  Spring, Fay, firm-joint or other radially opening type calipers have jaws that swing open with a scissor or plier-type action.  These calipers are commonly found in non-graduated versions; although units with graduated, dial, or digital displays are available. 

Measurement units for calipers can be either English or metric.  Some calipers are configured to measure both.  The display on calipers can be non-graduated meaning that the caliper has no display, dial or analog display, digital display, column or bargraph display, remote display, graduated scale display, or Vernier scale display.  Important specifications for calipers include the range and the graduation or resolution.  The range covers the total range of length or dimension that the caliper can measure.  The graduation or resolution is the best or minimum graduations for scaled or dial-indicating instruments, or the best or minimum resolution for gages with digital displays. 

Common features of calipers include depth attachments or gages and marking capabilities.  A depth attachment is a gage specialized for depth measurements usually consisting of a solid base with a protruding rod or slide.  The solid depth base provides a reference and support across the opening.  Marking capabilities include gages that accommodate a scribe or other device for accurately marking a component at a specific measurement along a particular dimension.

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

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Verniers and Micrometers

T + M ®

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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

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Time Group




Superior Electric


S.E.W. Standard Electric Works

Part No:  DC-515

Digital Vernier, 150 x 0.01mm, 6” x 0.001”,  mm/inch Select, Zero Button.

Lutron DC-515 Vernier


Lutron DC-515 Vernier

Part No:  DC-530

Digital Vernier, 300 x 0.01mm, 12” x 0.001”,  mm/inch Select, Zero Button.

T + M

Lutron DC-530 Vernier
Lutron DC-530 VernierLutron DC-515 VernierLutron DC-530 Vernier km machines d com

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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Part No:  137-203

Digital Inside Micrometer, 25 - 500 mm x 0.001mm Model 137-203.


Mitutoyo Inside Micrometer 25mm to 500mm.
Mitutoyo Inside Micrometer 25mm to 500mm. RGC EngMitutoyo Inside Micrometer 25mm to 500mmMitutoyo Inside Micrometer 25mm to 500mm
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Also: Thermal Imagers

FLIR TG267 Thermal Imagng Spot Non Contact Thermometer