Altek 942

Laboratory Accurate - ±0.001% of setting (10 PPM).
Six Real World Ranges - 1 to 20000 Counts-Per-Hour (CPH), 0.1 to 2000.0 Counts-Per-Minute (CPM), 0.01 to 999.99 Hz, 0.001 to 99.999 kHz and 0.01 to 250.00 kHz.
Calibrate Totalizers - Output a selectable number of pulses over 1 to 99 minutes to verify totalizer readings. The calibrator automatically stops outputting when the selected number of pulses has been sent to the totalizer.
Count Pulses - Use as a timed totalizer to check flowmeter and integrator outputs. Built-in totalizer to 99999 counts with an optional timed operation to 99 minutes up to maximum rate of 100 Hz.
Save Time - Calibrate flowmeters, frequency transmitters, and integrators. Use CPH and CPM ranges to directly display extremely slow signals, eliminating waiting with stopwatch and calculator.
Match Your Receiver's Input
Select from sine, zero crossing square or zero-based square wave output. Adjustable amplitude from 50 mV to 12 V p-p.
Reads All Waveforms From 40 mV to 240 V peak. Instantly recall the minimum and maximum frequency measured.
Quik-Chek Switch - Instantly recall 18 output frequencies (three for each range). Fast, easy adjustment with a multi-speed digital potentiometer.
Built-In Leads - Large alligator clips for easy connections. Optional BNC connector available.
Long Battery Life - Six AA alkaline batteries last over 40 hours.