Gain Express Dissolved Oxygen Meter with Electrode Portable DO Meter Water Quality Tester with Large LCD Display ATC 99 Memory Function

Educational: Ideal for quick, accurate DO readings in laboratories and schools 
Fatures include 99 memory data with Temperature readings, auto-power off by selecting time frame, Max / Min / AVG function help to analyze the data.

Features: 
Big LCD with D.O and temperature value display 
Stability indication 
Auto temperature compensation 
Easy 100% D.O value calibration 
Auto power off time selectable (20/30/40/60/90/120 MINS) 
Offered with most cost effective clark type oxygen electrode 
Accurate Dissolved Oxygen readings 

Specifications
Operating Temperature & RH% Humidity :0~50 °C / < 80%
Barometric Pressure: 500~1499 mmHg / 66.6~199.9 KPa
Dissolve Oxygen Accuracy: ±1.5% F.S
Dissolve Oxygen D.O Range :0~199.9% / 0~19.99 PPM / 0~19.99 mg/
Pressure Resolution :1 mmHg / 0.1 KPa
Adjustable Coefficient of membrane 
Time / Recall included 
LCD size : (h) 44 mm x (W) 26 mm 
Sensor Life Time: more than 6 months (with good maintenance) 
Dimension: (h) 175 mm x (W) 70 mm x (h) 33 mm 
Weight of D.O. Meter : 150g (without battery) 
Weight of whole set: 1075g

Set includes: 
1 x Dissolved Oxygen Meter 
1 x Probe with 333cm Cable 
4 x FREE AAA batteries 
5 x Teflon Membrane 
5 x O-ring 
2 x Replacement Electrolyte Solution 
1 x Filler Tube (Use for Filling Electrolyte into D.O. Electrode) 
English Instruction Manual 
Sturdy & Protective Carrying Case