It also houses a miniaturized amplifier to boost the signal and provide greater stability in spot measurements. The dual-level LCD shows the pH value from 0 to 14 in hundredths of units. It also displays the temperature on the secondary level at the same time. With a menu-driven custom microprocessor, the user is helped with clear prompts during operation and calibration. The batteries provide up to 1000 hours of continuous operation and indicate the battery level at any time.
Calibration is completely automatic and the meter recognizes the buffers too.
Any value set by the user as well as the calibration data are retained even during battery replacement. HI 991000 is ergonomic and has been made for single-handed use. Together with the meter you will also receive a handy booklet which explains how pH should be measured as well as general information about the correct limits in greenhouses, nurseries, fertilizer solutions as well as fruit and vegetable.