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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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Carbon Dioxide & Monoxide Meters

CO 2, CO Meters

Part No:  GCH-2018

Carbon Dioxide Meter (CO2)/ Humidity / Temp / Dew Point,     0 to 4000ppm (1ppm), 0 to 50degC, 10% to 50degC, 10%to 95%RH (0.1%)

Lutron Instruments GCH-2018 Carbon Dioxide CO2 meter


Lutron Instruments GCH-2018 Carbon Dioxide CO2 meterLutron Instruments GCH-2018 Carbon Dioxide CO2 meter

Part No:  GC-2028

Carbon Dioxide Meter (CO2)/ Temp.    0 to 4000ppm (1ppm), 0 to 50degC, 10% to 50degC, 10%to 95%RH (0.1%)

Lutron Instruments GC-2028 Carbon Dioxide Meter


Lutron Instruments GC-2028 Carbon Dioxide Meter

Part No:  GCO-2008

Carbon Monoxide Meter, (CO) and Temperature

Lutron Instruments GCH-2008 Carbon Monoxide CO meter


Lutron Instruments GCH-2008 Carbon Monoxide CO meter
Lutron Instruments GCH-2008 Carbon Monoxide CO meterLutron Instruments GC-2028 Carbon Dioxide Meter

Notes on Gas Instruments in General.

Gas instruments detect, monitor or analyse gases present in an environment. Detectors sense situations outside normal operating parameters and are set to alarm when these conditions are exceded. Monitors can also be set up to trigger an alarm, but their role is to determine which gases are in the sample being measured, and in what quantity they are present. Analyzers provide a breakdown of what is found, log the information, and can download it to a computer where further analysis and record keeping can be performed. Gas instruments and air instruments can sense sometimes just one gas or else can sense multiple types of gases with one instrument.

When analysing gases there are a few basic types of measurements that can be made. Percent LEL or lower explosive limit or lower flammable limit (LFL) of a combustible gas is defined as the smallest amount of the gas that will support a self-propagating flame when mixed with air (or oxygen) and ignited. In gas-detection systems, the amount of gas present is specified in terms of % LEL: 0% LEL being a combustible gas-free atmosphere and 100% LEL being an atmosphere in which the gas is at its lower flammable limit. The relationship between % LEL and % by volume differs from gas to gas. Another measurement is percent volume, which measures the amount of a specific gas within a sample. Trace measurement is usually given in units of ppm or ppb. Leakage and consumption rates can also be measured, as can gas density and signature or spectra, which is the spectral signature of the gases present.

Specifications for gas instruments are first what type of gas the application requires sensing and second how many channels the instrument needs to sense through. This can be for multiple types of gas sensors, redundant sensors for the same gas, or for placing sensors throughout a location to get sampling at many different spots. Other factors to consider are response time, maximum distance from leak that the detector can detect gases, and flow rate through the sensor.

Gas instruments can be detectors, monitors or analyzers. A gas detector will detect situations outside normal operating parameters. It is set up to alarm of this situation and covers gas leak detectors as well. A monitor is set up to alarm and determine which gases are present and in what amounts. An analyzer will analyze what is found, log the information and has the ability to download to a computer for further analysis.

These instruments can typically be handheld, larger portable devices or permanently mounted instruments. They have four primary purposes: personal exposure monitoring, air quality monitoring, confined space monitoring, and process gas monitoring.

General available features for gas instruments can include temperature and humidity measurements, external or internal sampling “sniffer” pump, interchangeable probes, alarm settings, controller functionality, self-calibration, data storage or logging, and usability in hazardous environments.


Indoor Air Quality.


As more energy efficient homes and buildings are built or modified, it is more important than ever to ensure healthy indoor air quality resulting in tightly-sealed, high performance building structures. There is a growing need to monitor air quality in schools, office buildings, greenhouses, factories, hotels, hospitals and anywhere that high levels of carbon dioxide are generated. Typical outdoor CO2 levels are <350ppm and safe indoor levels are <1000ppm. Without adequate ventilation, these levels could rise resulting in drowsiness (<2000ppm); headaches, sleeplessness, poor concentration, nausea (<5000ppm); up to a lack of oxygen (>5000ppm) which could cause health problems.

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

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Carbon Dioxide, Carbon Monoxide Meters

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Part No:  CO2-9904SD

Carbon Dioxide Meter Real Time Data Logger Recorder (CO2)/ Humidity / Temp / Dew Point, Wet Bulb, 0 to 6000ppm (1ppm), SD Card, Sample time adj.

Lutron Instruments CO2-9904SD Carbon Dioxide CO2 Reat Time Data Logger Meter


Lutron Instruments CO2-9904SD Carbon Dioxide CO2 Reat Time Data Logger MeterLutron Instruments CO2-9904SD Carbon Dioxide CO2 Reat Time Data Logger Meter
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Part No:  PCO-350

Carbon Monoxide Meter, (CO) and Temp. 0-50C  and   0-1000 PPMx 1 PPM. Fast Response, High Repeatability and accuracy with CO alarm setting. Data Hold.

Lutron Instruments PCO-520 Carbon Monoxide CO meter


Lutron Instruments PCO-520 Carbon Monoxide CO meter
Lutron Instruments PCO-520 Carbon Monoxide CO meter

Part No:  COH-9902SD

Carbon Monoxide Meter Real Time Data Logger Recorder. CO,Temp, Humidity, Wet Bulb & Dew Point. 0-50C  and   0-1000 PPMx 1 PPM. SD data to EXCEL directly.

Lutron Instruments COH-9902SD Carbon Monoxide CO meter


Lutron Instruments COH-9902SD Carbon Monoxide CO meter
Lutron Instruments COH-9902SD Carbon Monoxide CO meterT+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

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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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