PulseDivePulse induction
PulseDive
3 kHzFrequency
200 ftDetector, IP68
19.4 ozWeight
View on Amazon PulseDive (opens in a new tab)Affiliate link
Fisher · Multi-frequency detector
Fisher CZ-21
The CZ-21 is Fisher's diving detector, running 5 and 15 kHz simultaneously. First Texas lists it as fully submersible to 250 ft, and also as IP54. It weighs 5.69 lb.
5-15 kHz2 frequencies
250 ftTwo ratings published, IP54
5.69 lbWeight, 2.6 kg
| Technology | Simultaneous multi-frequency |
|---|---|
| Frequencies | 5 and 15 kHzDual frequency, 5 and 15 kHz simultaneously |
| Waterproofing | IP54, detector submersible to 250 ftBoth values are printed by First Texas. An IP54 rating does not cover submersion, so ask Fisher which applies before a dive. |
| Weight | 5.69 lb (2.6 kg) |
| Coil | 10-inch |
| Battery | 4 x 9 V (not included) |
| Battery life | up to 55 h (product page)35-5 h (spec sheet, as printed)Fisher publishes both. |
| Search modes | Target-ID, Auto-Tune, Pinpoint |
| Target ID | 3-tone audio Target-ID (product page)Target ID: No, Numeric ID: No (spec sheet)Fisher publishes both. |
| Display | Analog (no backlight) |
| Headphones | Waterproof headphones permanently attached |
| Warranty | 2 years |
| Status | In the current range |
Source: First Texas Products, Fisher CZ-21 product page (opens in a new tab), read Oct. 16, 2026.
Source: First Texas Products, Fisher CZ-21 spec sheet (PDF) (opens in a new tab), read Oct. 16, 2026.
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How it differs from its neighbors
Nokta's PulseDive is a handheld for the same diver, on pulse induction at 3 kHz. Nokta rates it IP68 to 200 ft (60 m), and it weighs 19.4 oz.
XP's Deus II is rated IP68 to 66 ft (20 m), with simultaneous multi-frequency programs. Fisher's F75 has only its coil waterproof.
Batteries are 4 x 9 V (not included). Runtime is printed two ways: up to 55 h on the product page, and 35-5 h on the spec sheet. We cite both and settle neither. The warranty is 2 years.
| Spec | DetectorCZ-21 | BundlePulseDive |
|---|---|---|
| Frequencies | 5-15 kHz5, 15 kHz | 3 kHz |
| Waterproofing | 250 ftDetector, IP54 | 200 ftDetector, IP68, 60 m |
| Weight | 5.69 lb2.6 kg | 19.4 oz550 g |
| Battery | 4 x 9 V (not included) | 1650 mAh lithium polymer (about 2 h to charge) |
| Target ID | 3-tone audio Target-ID (product page)Target ID: No, Numeric ID: No (spec sheet)Fisher publishes both. | Not published |
| Display | Analog (no backlight) | Not published |
View on Amazon CZ-21 (opens in a new tab)Affiliate link | View on Amazon PulseDive (opens in a new tab)Affiliate link |
Facts from First Texas Products' and Nokta's pages for each model, read Oct. 16, 2026.
03
Models to compare
Three facts per model on one scale; open a card for its full spec sheet.
DeusMulti-frequency
Deus II
4-45 kHzFrequency
66 ftDetector, IP68
Not checkedWeight
View on Amazon Deus II (opens in a new tab)Affiliate link
F-SeriesSingle frequency
F75
13 kHzFrequency
CoilWaterproof part
3.5 lbWeight
View on Amazon F75 (opens in a new tab)Affiliate link
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Questions about the CZ-21
Answered from First Texas Products' product page, read Oct. 16, 2026.
First Texas prints two values: fully submersible to 250 ft, and IP54. They do not agree, so confirm with Fisher before you dive.
Two at once: 5 and 15 kHz simultaneously. First Texas calls it a dual-frequency detector.
The spec sheet lists an Analog (no backlight) display. Targets also come through the 3-tone audio Target-ID in the attached headphones.
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