Bole Hole Locator
The Model BH-30 is a third generation instrument
designed to rapidly locate pilot holes that have failed to intersect a drift or other accessible target area.
The equipment consists of a rugged waterproof Transmitting Probe and a small battery powered signal strength Receiving Unit.
When a drill hole fails to intersect the drift
(or other open target area) the drill rods are removed
and the BH-30 Transmitting Probe activated and lowered
to the target depth.The BH-30 Receiver may then be
used to obtain the approximate distance and direction
of the Probe by an operator walking within the target
area and observing received signal strength. 
The BH-30 Transmitting Probe may be used with the BH-10 or BH-20 Receiver Unit. It is powered by 4 ‘C’ cells and is Crystal controlled at 990Hz.
The BH-30 Receiver Unit is tuned to 990Hz and powered by two standard ‘9v’ batteries. A solid-state columnar readout provides distance in feet from the Transmitting Probe.
| Maximum Range: | 45 feet (13.71m) |
| Probe Diameter: | 1 ¾ inches (44.45 mm) |
| Probe Length: | 26 inches (660.4 mm) |
| Probe Batteries: | 4 alkaline ‘c’ cells |
| Receiver Batteries: | 2 alkaline ‘9v’ cells |
