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Connect the plug to the main power socket and switch ON the power supply.

4.1.2 Connect the auto marker to the instrument from the left side.

4.1.3 Reset the inverted petri dish on the graduated glass plate.

4.1.4 Focus the magnifying lens. Reset the automatic counter, by pressing the ‘RESET’ button. The counter should read ‘0000’.

4.1.5 Remove the cap of the probe and touch the marking point of the probe on the petri-plate where a bacteriological colony is located. Press the probe gently. The counter will register a count with a beep as each colony is marked on the petri-plate. Continue till all the colonies are thus counted.

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