Hanna Instruments HI3220 series meters include a new diagnostic tool that allows users to dramatically improve measurement reliability. Calibration Check™ diagnostics system ensures accurate readings every time by alerting users of potential problems during the calibration process. These problems include whether to clean the electrode or check your buffer. After calibration, a probe condition indicator is displayed on the LCD informing the user of overall electrode status. Other features include: Large backlit graphic LCD, Auto HOLD to freeze readings on the display, and PC compatibility via USB.

Meters HI3220 and HI3221 offers a single input. Meter HI 3222 features up to 5-point calibration with a choice of 5 custom and 7 standard buffers. Users are guided through calibration with graphic prompts on the LCD. Feature a user selectable “outside calibration” warning as well as a user selectable “calibration time-out” warning. Equipped with 2 electrode input channels— eliminates the need for swapping probes and recalibrating.

All models include a glass-body, single-junction, refillable combination pH electrode with BNC connector and stainless steel temperature probe.

SPECIFICATIONS
Meter	HI 3220	HI 3221	HI 3222
Range:
pH	–2.000 to 20.000 pH
mV	±2000
ISE	--	From 1.00 x 10-3 to 1.00 x 105 ppm	From 1.00 x 10-7 to 9.99 x 1010 concentration
Resolution:
pH	0.001 pH
mV	0.1 mV
ISE	--	3 digits 0.01; 0.1; 1; 10 concentration
Temp	0.1°C (0.1°F)
Accuracy:
pH	±0.01; ±0.002 pH
mV	±0.2 mV
ISE	--	±0.5% of reading (monovalent ions), ±1% of reading (divalent ions)
Temp	±0.2°C (±0.4°F) (excluding probe error)
pH Calibration:	Up to 5-pt calibration, 7 standard buffers available + 5 custom buffers
ISE Calibration:		Up to 2-pt calibration, 6 standard solutions	Up to 5-pt calibration, 6 standard solutions
Temp Compensation (pH):	Manual or automatic from –20.0°C to 120.0°C (–4.0 to 248°F)
Logging:	Log-on-demand 200 samples	Log-on-demand 300 samples	Log-on-demand 400 samples