This indicator from HANNA® has a large, dual-level backlit LCD to give you instantaneous readings of both pH and temperature, even from a distance. The HI 991401 microprocessor provides for automatic calibration, automatic buffer selection and automatic temperature compensation.
HI 991401's waterproof housing has been designed to meet the grower's need, and is well suited to withstand the aggressive environments found in agricultural and hydroponics applications. Measurements are highly accurate and can be verified with one or two point calibrations. With a 12 Vdc power supply included with the meter, low battery failures are never an issue.
The interchangeable pH electrode and has been specially designed to address the needs of growers. Its design guarantees greater clogging resistance in fertilizer solutions with high concentrations of phosphate, nitrate, etc. This is a major improvement ensuring longer life for your electrode!

Range	pH	0.0 to 14.0 pH
Range	Temperature	0.0 to 60.0°C (32 to 140°F)
Resolution	pH	0.1 pH
Resolution	Temperature	0.1°C (0.1°F)
Accuracy	pH	±0.1 pH
Accuracy	Temperature	±0.5°C (±1°F)
Probe	 	HI 1293D pH electrode (included) and HI 1294 temperature probe (fixed)
pH Calibration	 	automatic, 1 or 2 points with 2 sets of memorized buffers
(pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)
Temperature Compensation	 	Automatic
Input Impedance	 	1012 Ohm
Power Supply	 	12 Vdc power adapter (included)
Environment	 	0 to 50°C (32 to 122°F); RH max 95%
Dimensions	 	160 x 105 x 31 mm (6.3 x 4.1 x 1.2)
Weight	 	190 g (6.7 oz.) - meter only