Teknetics Delta 4000

The Delta 4000 runs one frequency, 7.8 kHz, with 3 modes and a numeric target ID backed by 3-tone audio. It weighs 2.6 lb with its stock 8-inch open concentric coil.

Specs read Oct. 16, 2026 on firsttexasproducts.comListed on Amazon as the detector alone

7.8 kHzOne frequency

CoilWaterproof part

2.6 lbWeight, 1.17 kg

Delta 4000 tech specsFacts from First Texas Products' product page, rewritten. A value First Texas Products does not publish is marked.
Technology	Single frequency
Frequencies	7.8 kHz
Waterproofing	Coil only (depth not published)Control box not weatherproof
Weight	2.6 lb (1.17 kg)
Coil	8-inch round (open) concentric
Battery	1 x 9 V (not included)
Battery life	Up to 25 h20-25 h
Search modes	3 modes
Sensitivity	12 levels
Target ID	Numeric target ID, 3-tone audio, no Fe readout
Display	LCD
Warranty	2-year limited
Status	In the current range

Source: First Texas Products, Teknetics Delta 4000 product page (opens in a new tab), read Oct. 16, 2026.

Source: First Texas Products, Teknetics Delta 4000 spec sheet (PDF) (opens in a new tab), read Oct. 16, 2026.

How it differs from its neighbors

The Teknetics Omega 8500 runs 7.69 kHz on a larger 10-inch concentric coil, round on one First Texas page and elliptical on another. It weighs 2.5 lb. It has 99 levels of sensitivity, a backlit LCD and All Metal plus Discrimination with 8 categories and notch.

Bounty Hunter's Land Ranger Pro, from the same maker, runs 7.6 kHz on an 11-inch DD coil, with All Metal plus six discrimination modes.

All three use a 1 x 9 V (not included) battery. The Delta and Omega carry a 2-year limited warranty, and the Land Ranger Pro lists 2 years.

Weight is close across the three. The Delta comes in at 2.6 lb (1.17 kg), the Omega at 2.5 lb. First Texas gives two figures on its Land Ranger Pro page, 2.87 lb and 2.4 lb.

Delta 4000 and Omega 8500 compared
Spec	DetectorDelta 4000	DetectorOmega 8500
Frequencies	7.8 kHz	7.69 kHz
Waterproofing	CoilWaterproof part	CoilWaterproof part
Weight	2.6 lb1.17 kg	2.5 lb1.1 kg
Battery	1 x 9 V (not included)	1 x 9 V (not included)
Target ID	Numeric target ID, 3-tone audio, no Fe readout	Numeric target ID, Fe readout, 3-tone audio and VCO
Display	LCD	Backlit LCD
	View on Amazon Delta 4000 (opens in a new tab)Affiliate link	View on Amazon Omega 8500 (opens in a new tab)Affiliate link