Accuracy is +/- 0.2ft of the reading, exclusive of temperature setting errors.

No. The distance for the normal well reading is 10 feet to 500 feet.

The measurement range is 10 to 500 feet (3 to 150m) in the normal “Nml” setting. For the deep “Dp” setting, the measurement range is 200 to 1200 feet (60m to 350m).

No, cascading water does not affect the accuracy of the reading as long as the cascading water does not block more than half of the well’s diameter.

The meter is specified for a bore diameter range of 1 to 10 inches (25 to 250 mm).

Yes! The water level measurement depends on knowing the velocity of sound in the well casing. This parameter is different for different gases. The meter is calibrated for air-filled casings with nominal humidity. (Methane-filled casings can have up to a 30% difference in readings.)

A hole that is at least big enough to allow the 5/8-inch-diameter round duct is needed to effectively use our meters.

Perforations in the casing that are above the water surface can reflect the sonic pulse and result in a measurement that is less than the true water level.

Ravensgate Corporation’s Sonic Water Level Meters are self-rated at IP64—water-resistant [totally protected against dust and splashed water from any direction].

No, this approach will usually not result in a reliable reading.

Yes, you can even measure the length of coiled pipe.

Accurate measurements are best assured when the temperature setting equals the average air temperature in the well casing. The temperature setting corrects for the variation of the velocity of sound with the air temperature in the well bore. The error is 0.1% per degree of temperature error.

Yes, you can use our meters on wells that have submersible pumps.

Our meter uses eight internal AA alkaline batteries. Yearly battery replacement is recommended.

Yes, Ravensgate Sonic Water Level Meters can be used on either capped or uncapped wells. For uncapped wells, a 6-inch temporary plastic cap is supplied with the meter. For larger well diameters, a cover can be easily made from any convenient material, such as plastic or sheet metal.

Your order can usually be shipped within two weeks after payment is received. Call for the current lead time.

As long as the pipes and wires do not occupy more than one-half of the bore area, there is usually no problem using the meters.

All Ravensgate Sonic Water Level Meters include a one-year warranty on components and workmanship.

Yes, Ravensgate Sonic Water Level Meters can be used with partially cased wells.

The one-year warranty covers the meter’s components and workmanship. Labor and shipping are not covered under the warranty

We usually do not recommend using our meters for this purpose because overhead pumps are installed at the top of the well casing that cause accessibility problems; our meter works best when reading at the top of the well.

The Ravensgate Sonic Water Level Meter comes with a 15-day trial period. There is a restocking fee. Contact us for details.

The Normal ignore distance reaches 65 feet, and the Deep ignore distance reaches 600 feet.

No. Damaged, non-repairable model 300 or 300DL meters may not be traded in for a new replacement model. Owners who send in damaged, discontinued model 200/200U meters for repair and are assessed as nonrepairable will receive a 10% credit towards the purchase of our newest model.