Rugged and reliable, the YSI Pro1020 provides everything you need in a
handheld instrument for the measurement of either pH or ORP, along with
temperature and dissolved oxygen.

User-replaceable sensors and cables along with convenient calibration
routine feature makes it extremely user friendly. Mil-spec (military
spec) connectors, IP67 waterproof and rubber over molded case, and
1-meter drop tests ensure the instrument remains in your hands to
provide years of sampling even in the harshest field conditions. The
feature set of the Pro1020 results in a low total cost of ownership over
the life of the product and proves that it is smarter, tougher, and more versatile.

Additional features include:

• User-replaceable cables and sensors provide versatility, reduce down-time and reduce overall cost of ownership.
• Available with 1, 4, 10, 20, and 30-m cable lengths standard (cable management kit included on all cables 4-m and longer).
• Smart calibration; the instrument remembers the previous calibration values and simply walks you through the routine.
• Stores 50 data sets; no need to write down data.
• Large graphic, backlit display and glow in the dark keypad. Usable
  in any lighting condition. The display is also visible when wearing
  polarized sunglasses.
• Tough. IP67, impact-resistant, waterproof case. Waterproof without the battery cover as well.
• Rubber over molded case provides extra durability. Military spec connectors are unsurpassed for ruggedness.
• Multiple languages include English, Spanish, French, and Portuguese.
• Choose either polarographic or galvanic DO sensors.
• Quick response times; 95% DO response time in approximately 8
  seconds with standard membrane (fastest response time in the market).
• 3-year instrument; 2-year cable; 1-year sensor warranty (Galvanic DO is 6-months)

When ordering the Pro1020 you must order the instrument, cable, and
dissolved oxygen (Polarographic of Galvanic), pH or ORP sensor
separately, allowing you to choose the system that best fits your
application. Temperature is part of the cable you order and included in
the cable purchase.

See more Environmental monitoring system here.

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