Renco® Preg-Tone®

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100% accurate at detecting pregnancy between 30 and 45 days. Newest model (Model 6) allows user to choose the animal to be tested.

The Renco® Preg-Tone® is For Use On Swine, Sheep or Goats. NOT FOR USE ON CATTLE.

The Renco® Preg-Tone® is a fast, safe and accurate ultrasonic pregnancy detector can be used for swine, sheep, alpacas, meat and dairy goats, pygmy goats, llamas, large rabbits, foxes, and many other animals over 8 pounds. It does not need to be seen or held during testing.

It uses ultrasound to detect amniotic fluid present during pregnancy. When this fluid is detected, the instrument produces a loud, continuous tone. If the animal is not pregnant, it produces an intermittent recurring tone. 100% accurate between 30 and 45 days depending on the animal type.

During testing, no lights are used, no buttons are pushed, thus attention is not diverted from the animal. Since it uses only loud, easy to hear tones to indicate both pregnancy and non-pregnancy, it can be clipped on the belt or kept in a pocket.

The rechargeable NiMH battery pack will last for years, and give many hours of testing on one charge. It automatically turns itself off when the battery needs recharging, protecting the user against erroneous readings due to insufficient power. A wall plug charger is supplied. Input Specifications: 100-240 VAC 50/60Hz .2A. includes wall plugs for major countries

All-metal construction guarantees against interference by radio waves in the atmosphere, a major accuracy problem with some ultrasound instruments. It is constructed of heavy gauge aluminum for ruggedness and ease of cleaning, yet the Preg-Tone® is still lightweight and small enough to slip in your pocket.


  • No lights to watch or buttons to push
  • Uses loud, easy-to-hear tones
  • Operates 6-8 hours on full charge
  • Rechargeable NiMH batteries
  • Battery charger included
  • All-metal construction
  • Small enough to fit in a pocket
  • 5' cord
  • Identification of feed-wasting non-producers and low producers at very early stages
  • Confirmation of pregnancy in animals purchased or sold
  • Savings resulting from increase in overall operating efficiency, permitting more efficient use of expensive farrowing installations


  • Operating Temp Range: 0° F to 120° F
  • Operating Time: Approximately 8 hours on a full charge
  • Dimensions: 6" x 2.7" x 2.15" 
  • Weight: 15.4 oz.

Swine: Testing may begin as early as 18 days (large litters, 11-12 piglets, will show positive at this stage), and open sows can be diagnosed as early as 30 days. Normal testing time in sows and gilts is 30-73 days.

Sheep: Using the position shown above, pregnancy testing in ewes can begin at 35 days with most diagnoses made by 45 days. Testing can also be done in the normal standing position, providing diagnosis at 60-65 days.

Goats: Testing may begin at 30-40 days on the right side. Put oil on test site. Probe is placed 2 in. (5cm) in front of the rear leg and 1-in (2.5cm) above the teat. When probe is in good contact, the intermittent tone will be heard. Aim probe 45° upwards and forwards i.e. towards the last rib. Scan across the uterus. If pregnant, the tone will turn into a continuous tone. Dairy goats such as the Oberhasli can be tested as early at 20 days.

Alpacas: Testing can begin at 30-40 days. Alpacas and llamas are tested on the left side. If unsuccessful, try the procedure on the right side. Place probe 6-8-in (15-20cm) down from the udder. (On maidens about 5-in (12cm)). Point probe straight into the abdomen at an angle defined by the shape of the abdomen.

Please Note: This product is not for use on cattle.

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