User Guide

• Use a Checktemp or a calibrated thermometer with a reso-

lution of 0.1° as a reference thermometer.

• Immerse the temperature probe in

the beaker with ice and water as near

to the Checktemp as possible.

• Press and hold first CFM and then

CAL to enter the temperature cali-

bration mode.

• Execute the password procedure.

• With pH 502, the meter will ask for the calibration proce-

dure code number. Use  or  to select code 1 for the

temperature calibration and press CFM to enter.

• CAL will blink on the LCD until the

meter confirms a steady reading.

• When the reading has stabilized at

a point near the first calibration

point, CAL will stop blinking and an

intermittent CFM will prompt the user

to confirm the first calibration.

• If the reading stabilizes at a reading

significantly variant from the first

setpoint, an intermittent WRONG

will prompt the user to check the

beaker or baths.

• After pressing CFM the unit will switch to the second cali-

bration point.

• Select 25 or 50°C by pressing  or .

0 °C

(32 °F)