RH490 V2.0 12/06

6

Minimum (MIN) Maximum (MAX) Function

The MIN/MAX mode allows the user to view only the lowest (MIN) or highest

(MAX) readings.

1.

Press the ”H MAX MIN” button twice and “MIN” appears on the display. The

LCD is now displaying the minimum value recorded in both the top and

bottom display. The display will not change until a lower reading is

registered.

2.

Press the ”H MAX MIN” button again and “MAX”

appears on the display. The LCD is now displaying

the maximum value recorded in both the top and

bottom display. The display will not change until a

higher reading is registered.

3.

To exit the MIN/MAX mode, press the ”H MAX

MIN” button again. The “MAX” icon will disappear.

Note: Max and Min values are recorded into memory

while the meter is on. The values are erased

when power is turned off.

Backlight

Press and hold the light button “

“ until the backlight turns on. To turn the

backlight off, press and hold the light button “

“ until the backlight turns off.

Automatic Power OFF

The meter has a default setting that automatically shuts the meter off after 10

minutes (indicated by the

symbol on the display).

This battery saving feature can be disabled.

To disable the auto power off function, press and hold the ”H MAX MIN” hold

button while powering on. The

symbol will not appear when auto power off

has been disabled.

The meter will revert to the default auto-off mode when powered off.

Maintenance

Cleaning and storage

1. The meter should be cleaned with a damp cloth and mild detergent when

necessary. Do not use solvents or abrasives.

2. Store the meter in an area with moderate temperature and humidity (refer to

the operating and storage range in the specifications chart earlier in this

manual).

Battery Replacement

When the battery becomes weak the “

“ battery symbol will appear on the

LCD. Replace the 9 Volt battery by removing the Philips head screw holding the

rear battery compartment cover to access the battery compartment. Ensure that

the compartment cover is securely fastened when finished.