Product Manual

THUNDER Laser Detector

Model 54 - Operation

When a laser beam is received, the beeper will also emit

audible signals. Fast beeping means the detector is too

high, continuous is on-grade, and slow is too low.

A Model 52 general purpose clamp is included with the

Model 54 to attach the detector to grade rods. To secure

the clamp to the detector, align the two dovetails of the

clamp to the grooves on the back of the detector. Slide the

clamp down onto the detector. A snapping action will

ensure the clamp is securely attached. To remove the

clamp, depress the thumb release tab and slide the

clamp upward.

1. Clamp lock tab and thumb release - tab for securing

and thumb release for removing clamp from detector.

2. Dovetail slots - attaches clamp to the back of detector.

3. Reference Indicators - points are aligned with detector

On-grade for grade rod readings.

4. Clamping Screw - tightens the clamp onto rods and

staffs by moving the traveling jaw.

THUNDER Laser Detector

Model 56 - Interior

1. Power Switch and Loudness Selector - turns the unit on

and off and selects volume level.

2. Beeper Output - emits distinct sound for High, Low, and

On-grade elevations.

3. Laser Reception Window - protects the photocells

which detect the laser signal.

4. LED (Light Emitting Diode) Display - visually indicates

the detectors position relative to the laser beam. Also

indicates power on and low battery warning.