- Automatic calibration
- Automatic Temperature Compensation
- Automatic buffer recognition
- Three standard buffer values
- Calibration tags on LCD
- Low battery indicator
- Auto shut-off
- HOLD function
- ºC and ºF measurements
HI 8424 is one of the most popular pH meters on the market. This instrument is able to perform pH, ORP and temperature measurements with a high degree of accuracy and fast response.
Calibration is automatic at one or two points with three memorized buffer values (pH 4.01, pH 7.01 and pH 10.01). Once the instrument has been calibrated, the buffer values used during calibration are displayed with tags on the LCD. This feature keeps users informed of the current calibration and helps to avoid taking measurements that are out of range.
Exchange the pH probe for an ORP probe to obtain ORP readings in the mV range.
Order Information:
HI 8424 is supplied with HI 1230B pH electrode, HI 7662 temperature probe, HI 70004 pH 4.01 buffer solution sachet, HI 70007 pH 7.01 buffer solution sachet, HI 700661 electrode cleaning solution sachets (2), battery, protective case and instructions.
Specifications
| Range | pH | -2.00 to 16.00 pH |
| ORP | ±699.9 mV; ±1999 mV | |
| Temperature | -20.0 to 120.0°C / -4.0 to 248.0°F | |
| Resolution | pH | 0.01 pH |
| ORP | 0.1 mV; 1 mV | |
| Temperature | 0.1°C / 0.1°F | |
| Accuracy | pH | ±0.01 pH |
| ORP | ±0.2 mV; ±1 mV | |
| Temperature | ±0.4°C / ±0.8°F | |
| Calibration | pH | automatic, 1 or 2 point with 3 memorized buffer values (4.01, 7.01, 10.01) |
| Offset | ±1 pH | |
| Slope | 75 to 110% | |
| Input Impedance | 1012 Ohm | |
| Temperature Compensation | Automatic, -20 to 120°C (-4 to 248°F) or manual without temperature probe | |
| pH Electrode | HI 1230B PEI body pH electrode with BNC connector and 1 m (3.3’) cable (included) | |
| Temperature Probe | HI 7662 stainless steel temperatures probe with 1 m cable (included) | |
| Slope Calibration | From 75 to 110% / ±1 pH | |
| Battery Type / Life | 9V / approximately 150 hours of continuous use; auto-off after 20 minutes of non-use or disabled (user-selectable) | |
| Environment | 0 to 50°C (32 to 122°F); RH max 100% | |
| Dimensions | 164 x 76 x 45 mm (6.5 x 3.0 x 1.8') | |
| Weight | 180 g (6.3 oz.) | |
| Warranty | 2 years (probe 6 months) |
US 15704 
GB 11454 
CA 8743 
AU 5343 
IE 2509 
BR 1506 
NZ 923 
SG 903 
