=> “Possibly the best frequencies in the 2.5 kHz range would be 2.4739 kHz for the upper and 2.511 kHz for the lower. You will have a hard time getting a zapper with these frequencies.”
Be happy!
These zappers : MZ3b, MZ_UZ have a narrow sweep of 33 different frequencies, rolling non stop.
Among them, you have
Harmonic 153 : 2522 Hz; 2519 Hz; 2516 Hz; 2513Hz
Harmonic 155 : 2503 Hz; 2500 Hz; 2497 Hz; 2494 Hz; 2491Hz; 2488Hz; 2484Hz; 2481 Hz; 2478 Hz
Harmonic 157 : 2472 Hz; 2469 Hz; 2466 Hz; 2463 Hz; 2460 Hz; 2457 Hz; 2454 Hz; 2451 Hz;
Harmonic 159 : 2442 Hz; 2439 Hz; 2436 Hz; 2433 Hz; 2430 Hz; 2427 Hz; 2424