The Evidence Guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.

Overview of assessment

Critical aspects for assessment and evidence required to demonstrate competency in this unit

Assessors should ensure that candidates can:

perform setup pre-use checks and shutdown procedures

perform calibration checks of basic equipment using standard procedures

obtain readings of the required accuracy and precision

recognise non-standard behaviour of instruments

assist with maintaining equipment in working order by performing basic maintenance tasks

follow all relevant OHS requirements

follow enterprise recording and reporting procedures.

Context of and specific resources for assessment

This unit of competency is to be assessed in the workplace or simulated workplace environment.

This unit of competency may be assessed with:

MSL973001A Perform basic tests.

Resources may include:

standard laboratory equipped with appropriate equipment and reference materials

enterprise procedures and standard methods, equipment manuals

calibration check standards and procedures

maintenance procedures.

Method of assessment

The following assessment methods are suggested:

review of the quality of test data/results achieved by the candidate over time

inspection of records and workplace documentation completed by the candidate

feedback from peers and supervisors

observation of the candidate performing calibration checks and basic maintenance tasks

In all cases, practical assessment should be supported by questions to assess underpinning knowledge and those aspects of competency which are difficult to assess directly.

Where applicable, reasonable adjustment must be made to work environments and training situations to accommodate ethnicity, age, gender, demographics and disability.

Access must be provided to appropriate learning and/or assessment support when required.

The language, literacy and numeracy demands of assessment should not be greater than those required to undertake the unit of competency in a work like environment.

This competency in practice

Industry representatives have provided the case studies below to illustrate the practical application of this unit of competency and to show its relevance in a workplace setting.

Manufacturing and construction materials testing

Laboratory assistants perform calibration checks and operate a range of laboratory equipment to ensure the quality of products. For example, the labelling on fertilisers specifies the total percentage of nitrogen [N or N(t)], the total percentage of phosphorus [P or P(t)] in all forms and the total percentage of potassium [K]. A 5-10-5 fertiliser contains 5% N, 10% P and 5% K. During the manufacture of fertiliser, an assistant in a quality control laboratory measures the concentration of nitrogen, phosphorus and potassium using standard analytical methods to ensure that the final products are within prescribed specifications. The assistant must pay particular attention to the equipment calibration check. If the equipment is out of calibration no amount of testing skill will result in accurate results. Selling out of specification fertiliser could result in a product recall or claims from users against the manufacturer.

Biomedical and environmental services

Laboratory assistants are quite often involved in routine collections and culturing of cells. Bacterial cells are often cultured and grown to large populations in order to provide material from which to extract biological materials. A quick method of determining when the cell growth has yielded enough cells is to determine the absorbance of the cell culture by measuring absorbance at 600 nm. An absorbance of 1 to 1.5 will give a good cell harvest. This method relies on the assistant being able to perform calibration checks on an ultraviolet-visible (UV-VIS) spectrometer.

Food and beverage processing

A laboratory assistant in the quality control laboratory of a fruit canning company is required to perform calibration checks and maintain and operate a range of equipment, including a pH meter. Canned pears, for example, are routinely checked for pH to ensure safe heat processing. While checking the calibration of the pH meter with the standard buffer solutions, the laboratory assistant found that stable pH readings could not be obtained. On closer inspection, it was found that the pH probe was damaged. This was reported to the supervisor. The probe was replaced and the meter was re-checked for calibration in readiness for routine testing.

Construction Materials Testing

A laboratory assistant has been allocated the task of performing in-house calibration checks on the laboratory's equipment. He/she has previously prepared a wall chart for the year that shows when the required calibration checks fall due in accordance with the NATA Field Application Document (FAD) for construction materials testing. The assistant consults the wall chart and notes that this month's calibration checks include checking the:

ice points of the liquid-in-glass thermometers

working sieves against the reference set

compaction hammers for compliance with specifications

repeatability of the balances.

A full calibration of one of the laboratory's nuclear density gauges is also required. He/she then telephones the local calibration authority to book the nuclear gauge in for calibration and prepares to perform the other in-house checks.

Required skills

Required skills include:

performing setup, pre-use checks and shutdown procedures

performing calibration checks of basic equipment using standard procedures

obtaining readings of the required accuracy and precision

identifying non-compliant equipment from specifications and/or previous checks

recognising non-standard behaviour of instruments

assisting with maintaining equipment in working order by performing basic maintenance tasks

following all relevant occupational health and safety (OHS) requirements

following enterprise recording and reporting procedures

Required knowledge

Required knowledge includes:

operational principles and methods for equipment use

basic sources of error in equipment operation and their control

role and importance of correct calibration

basic equipment maintenance procedures

enterprise communication and reporting procedures

relevant OHS and environment requirements

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.

Codes of practice

Where reference is made to Industry codes of practice and Australian/international standards, it is expected the latest version will be used

Standards, codes, procedures and/or enterprise requirements

Standards, codes, procedures and/or enterprise requirements may include:

Australian and international standards such as:

AS/NZS 2243 Set:2006 Safety in laboratories set

AS ISO 17025-2005 General requirements for the competence of testing and calibration laboratories

Australian code of good manufacturing practice for medicinal products (GMP)

National Association of Testing Authorities (NATA) Field Application Documents (FADs)

calibration check and maintenance schedules

enterprise recording and reporting procedures

equipment manuals

equipment start up, operation and shutdown procedures

material safety data sheets (MSDS)

material, production and product specifications

national measurement regulations and guidelines

OHS national standards and codes of practice

principles of good laboratory practice (GLP)

production and laboratory schedules

quality manuals

standard operating procedures (SOPs)

Typical equipment and instruments

Typical equipment and instruments may include:

balances, pipettes, burettes and volumetric glassware

colorimeters/spectrometers and polarimeters

compaction rammers and soil classification equipment

conductivity meters and pH meters

disintegration apparatus, thermometers, incubators and water baths

instrument chart recorders, penetrometers, force measuring equipment and tensiometer

melting point apparatus, viscometers and hardness testing equipment

mixing and separating equipment such as centrifuges, rifflers and splitters, and mixers

noise meters and blasting meters

optical microscopes

Occupational health and safety (OHS) and environmental management requirements

OHS and environmental management requirements:

all operations must comply with enterprise OHS and environmental management requirements, which may be imposed through state/territory or federal legislation - these requirements must not be compromised at any time

all operations assume the potentially hazardous nature of samples and require standard precautions to be applied

where relevant, users should access and apply current industry understanding of infection control issued by the National Health and Medical Research Council (NHMRC) and State and Territory Departments of Health