• Waterproof - The HI99151 is a waterproof meter rated IP67 for immersion in up to one meter of water for 30 minutes.
• Automatic Calibration - One or two-point calibration is automatic to two selectable buffer sets.
• Automatic Temperature Compensation – An integrated temperature sensor allows for automatic temperature compensation of pH measurements.
• Multi-Level LCD Display - The split-level LCD displays both pH and temperature readings, along with indicators for reading stability, battery percentage, and calibration instructions.
• On-Screen Tutorial - Clear tutorial messages and directions are available on-screen to quickly and easily guide users through setup and calibration.
• Battery Error Prevention System - The meter will automatically shut off if there isn’t enough power to obtain an accurate measurement.
• Battery Life Indicator - The battery percent level is displayed at start up alerting the user to the remaining battery power that is available.

Specifications:

pH Range: -2.00 to 16.00 pH
pH Resolution: 0.01 pH
pH Accuracy: ±0.02 pH
pH Calibration: automatic, at one or two points with two sets of buffers (standard 4.01, 7.01,10.01 or NIST 4.01, 6.86, 9.18)
Temperature Range: -5.0 to 105.0°C / 23.0 to 221.0°F
Temperature Resolution: 0.1°C / 0.1°F
Temperature Accuracy: ±0.5°C (up to 60°C); ±1.0°C (outside) / ±1°F (up to 140°F); ±2.0°F (outside)
Temperature Compensation: automatic from -5.0 to 105.0ºC (23 to 221ºF)
Electrode/Probe: FC214D pre-amplified pH probe with internal temperature sensor, DIN connector and 1 m (3.3’) cable (included)
Battery Type/Life: 1.5V (3) AAA / approximately 1200 hours of continuous use; auto-off after 8 minutes of non-use
Environment: -5 to 50°C (23 to 122°F); RH max 100%
Dimensions: 152 x 58 x 30 mm (6.0 x 2.3 x 1.2”)
Weight: 205 g (7.2 oz.)

Supplied with FC2143 pH/temperature probe, HI70004 pH 4.01 buffer solution sachet (20 mL), HI70007 pH 7.01 buffer solution sachet (20 mL), HI700661 electrode cleaning solution sachets (2 x 20 mL), batteries, instruction manual, and hard carrying case.

Warranty: 2 years (probe 6 months)

Probes

• 639-240-10 (FC214D): DIN connector, compatible with older models
• 639-241-22 (FC 2143): Quick DIN connector, compatible with newer and older models