84131 AZ Dissolved Oxygen Device features:
* Big LCD with D.O. & Temperature display
* 100% D.O. calibration in air. Chemical is not required
* Easy replaceable thin membrane kit with high sensitivity
* Refill electrolyte quickly. Simple to maintain
* Selectable % and mg/L unit for D.O. Value
* °C/°F automatic temperature compensation built-in
* Manual salinity and barometric pressure compensation
* Environment green re-chargeable battery via type C port
* Brightness adjustable backlight for dark places

Specification:

Specification of 8413 AZ DO Pen with long cable probe:

Model	8413
DO Measuring Range	0.0~199.9 (in %)
DO Accuracy	±3% F.S (in %)
DO Resolution	0.1% (in %)
DO Measuring Range	0.00~20.00 (in mg/l)
DO Accuracy	±0.4 (in mg/l)
DO Resolution	0.01 (in mg/l)
Temp. Measuring Range	0~50.0℃, 32~122°F
Temperature Accuracy	±0.5℃, 0.9°F
Temperature Resolution	0.1℃
Manual Compensation	Included
Salinity Adjustable Range	0.0~45.0 ppt
Salinity Resolution	0.1 ppt
Barometric Pressure Adjustable Range	500~760 mmHg/101.3~66.7 Kpa
Barometric Pressure Resolution	1 mmHg/0.1 Kpa
Auto Temp. Compensation	10~40.0℃ 50~104°F
LCD Size	30(L) *1 8 (W) mm
Operating Temperature	0~40℃
Operating RH%	Humidity ＜85%
Storage Temperature	0~40℃
Storage RH%	Humidity ＜80%
Sensor Response Time	＜30 seconds
Sensor Warmup time	＜60 seconds after power up
Sensor Life Time	>6 months (with good maintenance)
Meter Size	176(L) * 39(W) * 39(H) mm
Weight	~265g
Battery	3.7V@500mAh re-chargeable battery
Power Consumption	60 hours operation (no backlight condition)
Re-charging Time	1.5 hours
Standard Package	Meter (with battery built-in), Dissolve Oxygen (D.O.) Probe, Electrolyte, 2PCS membrane kits, USB-type C charging cable, Manual, Carry Cas