Instument
Type c

Deluxe
pH Meter Model 151 R.

Deluxe
pH Meter Model 152 R.

Portable
pH Meter Model 153 R.

Measurement

pH & ORP

pH & ORP

pH

Display

3 ½ Digit LED

3 ½ Digit LED

3 ½ Digit LCD

Range

0-14.00 PH

0i±1999 mv

0-14.00 pH

0i±1999 mv

0-14.00 pH

Resolution

0.01 pH,1mv

0.01pH,1mv

0.01pH

Accuracy

i0.01pH, i±1mv

i0.01pH, i±1mv

i0.01pH

Temperature compensation

Auto+manual

0 to 100^oc

Manual

0 to 100^oc

Manual

0 to 100^oc

Slope Control

80 to 120%

80 to 120%

80 to 120%

Recorder Output

0 to 10mV/pH

Adjustable

0 to 10mV/pH

Adjustable

–

Power requirement

220VAC +10%50HZ

220VAC +10%50HZ

1 x 9V battery