Reliable DO readings at a reasonable price

Measures dissolved oxygen to determine water quality in environmental testing, labs, industrial and municipal wastewater, aquariums and fish hatcheries. The back-lit display simultaneously displays dissolved oxygen (in % or mg/L) and temperature readings (in °C or °F). Automatic temperature compensation as well as manual compensation for salinity and altitude. Features simple one-button calibration to air. DO probe heads include built in membranes and screw on and off for easy replacement. Also functions as a pH, ORP, Conductivity, TDS or Salinity meter when used with the optional probes (sold separately).

Comes in a hard carrying case complete with one DO probe, two spare probe heads, electrolyte, instructions and a 9V battery. 

EPA Equivalency Method: 360.1.

Meter Dimensions: 7" × 2¾" × 1¼" (177 × 68 × 45 mm)
Meter Weight: 16 oz (489 g)
Kit Dimensions: 11" × 9½" × 2" (279 × 241 × 51 mm

Specifications

Downloads

Instruction Manual

Product Brochure

Compare Sper Scientific Dissolved Oxygen (DO) Meters

Model Number	850045	850048DOK	850081DOK	860055	860067	860073
Product Name	Waterproof DO Meter Pen	Combination Water Meter Kit w/ DO Probe	Dissolved Oxygen Meter Kit	Rechargeable DO Pen w/ 5 Meter Cable	Optical Dissolved Oxygen Meter	Portable Optical Dissolved Oxygen Meter
DO Range (% Saturation)	0–100% O₂ in air	0–200%	0–100.0%	0.0–199.9%	0.0–200.0%	0-200%
DO Range (mg/L)	0–20.0 mg/L	0–20.0 mg/L	0–20 mg/L	0.00–20.00 mg/L	0.0–20.0 mg/L	0 -20 mg/L
DO Accuracy (mg/L)	±0.4 mg/L	±0.4 mg/L	±0.4 mg/L	±0.4 mg/L	<5: ±0.3 mg/L≥5: ±0.4 mg/L	±0.3mg/L
DO Resolution (mg/L)	0.1 mg/L	0.1 mg/L	0.1 mg/L	0.01 mg/L	0.1 mg/L	0.01mg/L
DO Accuracy (%)	±0.7% O₂	±2% F.S.	±0.7% O₂	±3% F.S.	±3% of Full Scale	±3%
DO Resolution (%)	0.10%	0.10%	0.10%	0.10%	0.10%	0.10%
Temp. Range	0–50°C / 32–122°F	0–50°C / 32–122°F	0–50°C / 32–122°F	0–50.0°C / 32–122°F	0–40.0°C / 32–104°F	0°–45°C / 32°–113°F
Temp. Accuracy	±0.8°C / 1.5°F	±0.5°C / 0.9°F	±0.8°C / ±1.5°F	±0.5°C / 0.9°F	±0.5°C (0.9°F)	±0.5°C / 0.9°F
Temp. Resolution	0.1°C	0.1°C	0.1°C	0.1°C	0.1°C	0.1°C
Auto Temp. Comp. (ATC)	√	√	√	10–40°C	0–40°C	√
Salinity Resolution				0.1 ppt	0.1 ppt
Barometric Pressure Comp.		Manual (altitude)	Manual (altitude)	500–760 mmHg(66.7–101.3 kPa)	Manual, 50–115 kPa	Manual (altitude)
DO Calibration	1-Point (air)	1-Point (air)	1-Button (air)	1-Point (100% air)	2-Point (0% & 100%)	2-Point (0% & 100%)
Probe Technology	Polarographic DO probe	Polarographic DO probe	Polarographic DO probe	Polarographic DO probe	Optical (fluorescent) DO probe	Optical (fluorescent) DO probe
Sensor Warmup Time	~30 min (cal.)	~30 min (cal.)		<60 seconds	None	~10 min (cal.)
Sensor Response Time				<30 seconds	Fast
Sensor/Probe Lifetime				>6 months	>1 year	>1 year
Measures pH		(optional probe)	(optional probe)
Measures ORP / mV			(optional probe)
Measures Conductivity/TDS		(optional probe)	(optional probe)
Measures Salinity	Via compensation	(optional probe)	(optional probe)	Via compensation	Via compensation	Via compensation
Memory / Data Storage	Max/Min record	99 memory points			99 memory points	+100,000 memory points
RS232 / Data Output			RS232			USB
Display Type	Dual LCD	Large backlit LCD	Backlit LCD	Backlit LCD	Large LCD	Large LCD
Simultaneous DO & Temp.	√	√	√	√	√	√
Backlight		√	√	√		√
Battery Type	(4) AAA	(4) AAA	9V	3.7V 500mAh Rechargeable Li-ion	(6) AAA	Rechargeable Li-ion
Charging				USB Type-C(~1.5 hr)		USB
IP Rating	IP-67				IP-67	IP-67 Housing / IP-68 Sensor
Spare Probe Heads	2 spare probe heads	2 spare probe heads	2 spare probe heads	2 spare probe heads
Electrolyte Solution	√	√	√	√