40 kHz - 169-200 dB. Weighs 230 grams (40 grams in water) and measures 185x52mm
Jar stone is no longer the same as iron stone. We produce weights for cheating in lead, with a strong stainless eye bolt fitted. No mess with rust in the boat and much less drift in the current. The weight lasts longer as the loop in the iron stone rusts away quickly.
Series 200 and 300 are electric while Series 500 and 700 are hydraulic. The pump must have the following specification: pressure: 140 and 12 liters per minute. The electric ones have row mounting, the hydraulic ones have deck mounting. Comes complete with arm. Call or write to us for more information.