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Dissolved Oxygen Meter "YSI" Model Pro20i

YSI Pro20i Dissolved Oxygen/Temperature


Portable Dissolved Oxygen Meter for the Field




Easy to use, rugged and reliable, the YSI Pro20i provides everything you need in a handheld


instrument for the measurement of dissolved oxygen (DO). A true field instrument with IP-67


waterproof, rubber over molded case, military spec connectors and 1-meter drop tests ensure


durability to provide years of sampling even in the harshest field conditions.




With the Pro20i, accuracy is not compromised for ruggedness. The Pro20i can easily be calibrated


for fast, accurate measurements you can trust.




§  Integral (i.e. built-in) cable with 1- 4- 10- m field cable


§  User-replaceable DO sensors


§  One Touch Cal allows for easy DO calibrations within 3 seconds with the press of a button


§  Automatic barometric pressure compensation


§  Quick response times; T-95 response time in 8 seconds with standard membrane (fastest response time on the market)


§  Stores 50 data sets; no need to write down data


§  Large graphic, backlit display and glow in the dark keypad, visible in any lighting condition


§  Display is visible when wearing polarized sunglasses


§  A true field instrument with IP-67, impact-resistant, waterproof case. Waterproof with and without the battery cover.


§  Rubber over molded, slip-proof case provides extra durability


§  Multiple languages: English, Spanish, French, and German


§  Warranty: 3-year instrument, 2-year integral cable, 1-year polarographic sensors, 6-month galvanic sensor




Pro20i System Specifications (Instrument, Probe, and Cable)




23 to 131F (-5 to 55C) 0 to 45C for DO compensation for mg/L

C, F


0.1F (0.1C)



+/-0.6F (+/-0.3C)

Dissolved Oxygen


0 to 500%

% Saturation


0.1% or 1% air saturation (user selectable)

% Local


0 to 200% air saturation, +/-2% of the reading or +/-2% air saturation, whichever is greater;

200 to 500% air saturation, +/-6% of the reading

Dissolved Oxygen


0 to 50 mg/L



0.01 or 0.1 mg/L (user selectable)



0 to 20 mg/L, +/-2% of the reading or +/-0.2 mg/L, whichever is greater;

20 to 50 mg/L, +/-6% of the reading



400 to 999.9 mmHg

mmHg, mbar, inHg,


0.1 mmHg

psi, kPa


+/-5 mmHg within +/-5C temperature range from calibration point


This product was added to our catalog on Thursday 02 August, 2018.
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Nanomachinery Co., Ltd.
4, Soi Petchkasem 100 ,Phetchkasem Rd. ,Bangkaenue ,Bangkae ,Bangkok, 10160, THAILAND.
Tel : 086-322-6876 ,02-421-9927 ,Fax : 02-809-2591 E-mail : pongthorn@nano-machinery.com
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