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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

Digital Tachometers


Part No:  DT-2234BL

Photo Type with Laser, 10 to 99,999 RPM ,                   Up to 2 meters detecting Distance, 0,05% Accuracy, microprocessor based, crystal timebase high precision.

R 4, 300.00

Excl VAT

Lutron Instruments DT-2234BL Photo Type Tachometer with LaserLutron Instruments DT-2234BL Photo Type Tachometer with LaserLutron Instruments DT-2234BL Photo Type Tachometer with Laser

Part No:  DT-2230 

Mini Type, Photo + Contact Tachometer, Photo with laser:        5—100,000 RPM, Contact: 5 — 19,999RPM, m/min, ft/min, RS232

Lutron Instruments DT-2230 Mini Tachometer Photo / Contact with Laser


Lutron Instruments DT-2230 Mini Tachometer Photo / Contact with LaserLutron Instruments DT-2230 Mini Tachometer Photo / Contact with Laser

Part No:  DT-2268 

Photo/Contact Tachometer, Multifunction

Lutron Instruments DT-2268D Digital Contact / Photo Tachometer


Lutron Instruments DT-2268D Digital Contact / Photo Tachometer

Part No:  DT-2235B

Contact Tachometer. 5 to 99,999 RPM with surface speed reading in Ft/min or m/min and memory.


Excl VAT

Lutron Instruments DT-2235B Contact Tachometer


Lutron Instruments DT-2235B Contact Tachometer


Lutron Instruments DT-2235B Contact TachometerLutron Instruments DT-2268D Digital Contact / Photo Tachometer

Tachometer, Panel Meter, 4 digit LED, 5 to 100,000RPM

Lutron Instruments DT-4240D Panel Meter Digital TachometerLutron Instruments DT-4240D Panel Meter Digital Tachometer


Part No:  PX-01

Proximity Sensor, 12 to 24 Volts, Output: 12 Volts DC, 100mV, Detecting Distance: 4 mm (Metal) (For DT2240D)

Lutron Instruments PX-01 Proximity Sensor


Lutron Instruments PX-01 Proximity Sensor
Lutron Instruments DT-4240D Panel Meter Digital TachometerLutron Instruments PX-01 Proximity Sensor

Notes on Tachometers.

Tachometers are used to measure the velocity of a rotating object. Tachometers operate on the principle that a driven motor (i.e., a motor operated as a generator) produces a voltage that is proportional to the angular velocity of the motor shaft. The proportionality constant, K that is used to translate mechanical motion into voltage has typical values of 1 to 30 volts per 1000 RPM.  Tachometers are typically attached to the output shaft of DC or AC inverter motors requiring close speed regulation. The tachometer feeds its signal to a control which adjusts its output to the DC motor or AC inverter motors accordingly (called "closed loop feedback" control). Tachometers can be of both the contact and noncontact type.

Common configurations for tachometers include handheld, portable, fixed, or modular.  Handheld instruments are specifically for using while holding in one hand.  Portable instruments have handles/case/wheels etc. to make easy to move, not necessarily held in hand to use.  Fixed instruments are fixed or used in one place, for example, benchtop, panel mount etc.  Modular instruments have different modules for interfacing to different sensors or input ranges.  Tachometers can have batteries for full operation, not just backup.

The two most important parameters to consider when specifying tachometers are operating speed range and accuracy.  Operating speed range is the range of rotary speed measurement the tachometer can monitor.  The accuracy is typically given in units such as ±RPM, etc.  The sensor technology used in tachometers can be contact type, photoelectric, inductive, of Hall effect.  In a contact type instrument the tachometer probe or sensor comes in contact with the rotating part.  In a photoelectric instrument light beams, visible or infrared, are employed to measure speed.  Technology may resemble optical encoders, where beam break frequency is used for speed calculation.  Inductive instruments use magnetic elements to induce magnetic fields; frequency of activation is used to measure speed.  Hall effect tachometers use Hall effect technology to determine rotational speed.

Features common to tachometers include totalizers or counters, timers, built-in or self-calibration, and self-test diagnostics.  Display configurations include analog visual indicators, digital numerical displays or graphic video displays.  User interfaces and control types include analog front panels, or digital front panels or computer programmable interfaces.  Some tachometers may come equipped with software for running on the hose computer.  Many have network or communications interfaces.  Available electrical outputs include analog voltage, analog current, analog modulated frequency, serial, parallel, and switch or alarm.

Part No:  DT-1236L

Photo+ Contact + Laser, Photo, Tachometer.                 10 to 99,999 RPM ,  Contact:0.5 to 19,999 RPM, m/min, ft/min

R 5,150.00

Excl VAT

Lutron Instruments DT-1236L Photo / Contact Tachometer with LaserLutron Instruments DT-1236L Photo / Contact Tachometer with LaserLutron Instruments DT-1236L Photo / Contact Tachometer with Laser


Part No:  DT-2259 

Stroboscope / Photo Tachometer. Dual Type.         100 to 99,999 RPM/FPM Flashes p/m on Strobe, and 0.1 to 100,000RPM on Photo. 3 Flash adjust Ranges.

Lutron DT-2259 Digital Stroboscope Tachometer


Lutron DT-2259 Digital Stroboscope Tachometer

Part No:  DT-2299 

Combo Stroboscope / Photo Tachometer. 5 Digit LCD Display (99999). Ranges: 100 to 99,999 FPM On Strobe, and  10 to 99,999 on Photo.

Lutron DT-2299 Digital Stroboscope


Lutron DT-2299 Digital Stroboscope
Lutron DT-2259 Digital Stroboscope TachometerLutron DT-2299 Digital Stroboscope

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Digital Tachometers

Part No:  PDT-2250

RPM Controller / Monitor. 5 to 100,000 RPM. Control Setting, Alarm Setting. Alarm and Control Relay Output, RS232 Computer Interface.


Lutron RPM Controller / Monitor
Lutron RPM Controller / MonitorLutron RPM Controller / Monitor

RPM Controller / Monitor

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Part No:  DT-2240D


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Part No:  DT-2337

Tachometer Photo+ Contact ,Photo - 5 to 99,999 RPM ,  Contact:0.5 to 19,999 RPM, m/min, ft/min, Stroboscope: 100 to 99,990 RPM. K Type Thermometer, and Pt 100.

Lutron Instruments DT-2337 Photo / Contact Tachometer for Elevators with Temp.Lutron Instruments DT-2337 Photo / Contact Tachometer for Elevators with Temp.


Lutron Instruments DT-2337 Photo / Contact Tachometer for Elevators with Temp.
T+M Instruments Lutron InstrumentEZ Digital Fluke Instrument Time Group High Time TechnologyFlir Infrared ThermometryITC Training Centre Thermography CoursesElektroPhysik
Promax Electronics Lodestar Electronics Acute PC-Based Instruments from Test andMeasurement Instruments C.C.Intercomp "For any Measure"MSR Electronics Superior Electric PowerstatK and H EducationalSEW InstrumentsRishabh LogoDanatronics LogoYokogawa Instruments T+M VERYTEK range of test and meaurement instrumentsRohde and ShwarzTMI PagerankMegger Test Instruments and Equipment, Megger South Africa, Megger SA.Extech Test and Measuring InstrumentsHurleyIR Military Night Thermal Cameras and GimbalsIntoximeters Breath Alcohol Testers

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

Clearance Sale:

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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