SKU: 18108139397

Ohaus ST300D Portable Dissolved Oxygen Meter

Sale price$309.82 Regular price$344.24
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Ships within 48 hours · Estimated delivery Aug 28 - Sep 2

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Description

Ohaus ST300D Portable Dissolved Oxygen MeterOhaus ST300D Portable Dissolved Oxygen Meter The Starter 300D provides accurate and reliable DO measurement, critical to aquatic life and water quality. With a simple calibration process, quick delivery of measurements and automatic temperature compensation, the Starter 300D is both easy to use and accurate. The automatic or manual endpoints allow the user to easily recall the last calibration data and stored information with one quick touch. The

Ohaus ST300D Portable Dissolved Oxygen Meter

The Starter 300D provides accurate and reliable DO measurement, critical to aquatic life and water quality.  With a simple calibration process, quick delivery of measurements and automatic temperature compensation, the Starter 300D is both easy-to-use and accurate.  The automatic or manual endpoints allow the user to easily recall the last calibration data and stored information with one quick touch.  The galvanic electrode can be used immediately after being powered on without the wait time typically associated with dissolved oxygen meters.  The 30-measurement library stores data for future reference and allows the user to easily recall the last calibration data with one quick touch. 

Packages - Available in three configurations:  

 ST300D-B ST300D ST300D-G
  • 300D Meter with IP54 sets
  • Electrode Clip
  • Wrist Strap
  • 4 AAA Batteries
  • Probes not included

 

 

  • 300D Meter with IP54 sets
  • Electrode Clip
  • Wrist Strap
  • 4 AAA Batteries
  • STD011 Galvanic DO Probe
  • STTEMP30 Temperature Probe
  • 300D Meter with IP54 sets
  • Electrode Clip
  • Wrist Strap
  • 4 AAA Batteries
  • STD011 Galvanic DO Probe
  • STTEMP30 Temperature Probe
  • Portable Bag

 

Specifications:

  • Measurement Range: 00 – 19.99; 20.0 – 45.0 mg/L; 200 – 400%; 0 – 50 °C
  • Measurement Resolution: 1 mg/L; 1 mg/L; 0.1%; 1%; 0.1 °C; 0.1 ppm; 1 ppm
  • Accuracy: ± 0.3 mg/L; ± 1%; ±0.3 °C
  • Display: LCD
  • Electrode: STDO11 (Not included in ST300D-B); STTEMP30 (Not included in ST300D-B)
  • Accuracy DO: 1%
  • Accuracy ± (Temperature) 3 °C
  • Battery Life: 250 Hours with Disposable Batteries
  • Calibration: 2-point
  • Dimensions: 38 in x 6.69 in x 3.54 in (35 mm x 170 mm x 90 mm) (HxLxW)
  • In-Use Cover: No
  • Measurement Range DO: 0 % – 200 %; 200 % – 400 %; 0 ppm – 20 ppm; 20 ppm – 45 ppm
  • Measurement Range (Temperature): 0 °C – 50 °C
  • Net Weight: 35 lb (0.16 kg)
  • Parameter: Dissolved Oxygen
  • Power: 4 AAA (LR03) Batteries (Included)
  • Resolution (DO): 01; 0.1
  • Resolution Range (DO): 01-0.1
  • Temperature Compensation: Automatic
  • Temperature Resolution: 1 °C
  • Temperature Sensor: 30 KΩ NTC
  • Working Environment: 41°F – 104°F, 80%RH, non-condensing (5°C – 40°C, 80%RH, non-condensing)

ST300D Compatible Probes:

  • Temperature Probe: STTEMP30
  • Galvanic DO Probe: STD011

Starter Series Data Sheet
ST300D Manual


Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 18108139397

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4.2 ★★★★★
Based on 12 reviews
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C
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Caleigh Meyer
Port Orchard, US
★★★★★ 4
Overall good toy for dogs
Color: Blue
My dog loves her snoop. I put little training treats in there for her, and she loves to roll it around and get the treats out. For her, it doesn’t last very long because they do fall out pretty easy, but she is a big dog so a smaller dog might have a harder time than her. Very sturdy and easy to travel with. Not noisy at all. I would say it’s a good, quick play toy for a dog like mine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026
A
Verified Purchase
Anel
Cuba, US
★★★★★ 5
Fav Chew Toy 🦴
Color: Blue, Color: Blue
My baby is half rottweiler and half doberman &’ he has a pretty strong grip when it comes to chew toys. But this one, it’s his favorite toy! He never leaves the house without it. It’s also really fun to add his favorite treats in there when’s he bored to keep him entertained! Not loud at all and will keep him from chewing on other things and not heavy as other rough chew toys!
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Reviewed in the United States on May 31, 2026
L
Verified Purchase
Love for Design
Belleville, US
★★★★★ 5
Great you made super well
Color: Blue Lil Snoop, Color: Blue Lil Snoop
This is such an awesome toy. It’s super durable strong bounces and a perfect size. We got the small. We got blue because our pup can see it. It allows for creativity and endless limits to what you can make for it to be a fun experience. It has a nice sized hole in the center which allows you to add treats and food. Pop it inward and it slightly if large enough prevents the treats from coming out super fast. The ball rolls bounces and they can grip it nicely. It is easy to clean The only thing I didn’t like was the way the plastic tabs were situated inside the toy as you just be careful you don’t allow it to drip inside and dog gets it. No noise just fun. Our 15lb Cavapoo loves it
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Reviewed in the United States on February 17, 2026
K
Verified Purchase
Kay
Omaha, US
★★★★★ 3
No challenge once they figure it out once, or if they have a long nose
Color: Blue
The first time I used this with my 9 month old Shepard mix, it was great. We used about 1/3 cup of her kibble and added the Nook to make it harder. It kept her working for 20-30 minutes. However, now that she knows how to remove the Nook, and stick her snout into the opening and lick up the kibble, it lasts about 5 minutes, and is no longer a challenge. She still enjoys playing with this, even when it is empty, and hasn't it destroyed it yet, so for that 3 stars.
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Reviewed in the United States on April 5, 2026
J
Verified Purchase
Jaq
Whiting, US
★★★★★ 5
Buy it — it’ll be your dogs best friend!
Color: Orange
Best treat toy ever! In the beginning of 2025 I bought this for my 12yr old Alaskan Malamute who loves puzzles and brain games. She loved it and played with it every day. Sadly, she passed middle of this year. Now in December, I have purchased this toy again for my newly adopted 10 month Great Dane puppy. Again, it’s an absolute hit! My Dane eats very fast, so I actually use this as a way to break up her meals. I put about half her meal (freeze dried raw kibble) in her slow feeder bowl and fill this toy about two times to feed her the other half. Also, we are crate training and before I leave the house I put treats in this toy and leave it in the crate with her. She has bad separation anxiety, but this toy actually seems to help calm her down because she enjoys it so much. I have bought many treat toys — this one is supreme. It’s not too loud or too difficult for the dogs to play with. So far it has held up without being chewed apart. It’s good quality, great size (orange for large breeds) and honestly, worth every penny.
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Reviewed in the United States on December 12, 2025

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