Model		HI 98230	HI 98240
Range	pH	4.00 to 19.99 pH	-4.00 to 19.99 pH
	mV	-	±400.0 mV; ±2000 mV
	temperature	10.0 to 120.0°C /-14.0 to 248.0°F	10.0 to 120.0°C /-14.0 to 248.0°F
Resolution	pH	0.01 pH	0.01 pH
	mV	-	0.1 mV(±400 mV); 1 mV(outside)
	temperature	0.1°C/0.1°F	0.1°C/0.1°F
Accuracy	pH	±0.01 pH	±0.01 pH
	mV	-	±0.5 mV(±400 mV);±2 m(outside)
	temperature	±0.5°C(0 to 70°C);±1°C(outside); ±1°F(32 to 158°F);±1.8°F(outside)	±0.5°C(0 to 70°C);±1°C(outside); ±1°F(32 to 158°F);±1.8°F(outside)
pH calibration		Automatic, 1 or 2 point with 5 memorized buffer values (pH 4.01, 6.86, 7.01, 9.18, 10.01)	Automatic, 1 or 2 point with 5 memorized buffer values (pH 4.01, 6.86, 7.01, 9.18, 10.01)
mV calibration		-	Automatic, 2 point at 0, 350 mV or 0, 350, 1900 mV
Temperature compensation		Automatic, -10 to 120°C (14 to 248°F)	Automatic, -10 to 120°C (14 to 248°F)
pH electrode		HI 1618D smart electrode with temperature sensor, DIN connector and 1 m(3.3') cable(included)	HI 1618D smart electrode with temperature sensor, DIN connector and 1 m(3.3') cable(included)
PC connection		HI 9200/9 IR interface, connector the computer RS232 serial port	HI 9200/9 IR interface, connector the computer RS232 serial port
Logging interval		Selectable at 1, 2, 5, 10, 15 30, 60, 120 or 180 minutes	Selectable at 1, 2, 5, 10, 15 30, 60, 120 or 180 minutes
Printing interval		Selectable at 1, 2, 5, 10, 15 30, 60, 120 or 180 minutes	Selectable at 1, 2, 5, 10, 15 30, 60, 120 or 180 minutes
Power supply		4 x 1.5V AA/approx. 350 hours of continuous use (with backlight OFF) or 12 Vdc input	4 x 1.5V AA /approx. 350 hours of continuous use (with backlight OFF) or 12 Vdc input
Environment		0 to 50°C(32 to 122°F);RH max95%	0 to 50°C(32 to 122°F);RH max 95%
Dimensions		220 x 87 x 75 mm(8.7 x 3.4 x 2.9")	220 x 87 x 75 mm(8.7 x 3.4 x 2.9")
Weight		550 g(1.2 lb.)	550 g(1.2 lb.)