Wide Application: 52mm/2 Inch Marine Depth Gauge Suitable for yachts, small and medium sized boats, fishing boats and other marine vehicles. Waterproof Design: the dial is IP67, and the back cover is IP65. Installation: easy to install, good durability and anti-vibration, equipped with alarm performance, flexible and simple operation. Item Type:Depth Gauge; Installation Diameter:. 52mm/2 inches; Depth Indication Range:. 100m/110yd; Backlight Color:White Working Voltage: +12VDC; Working Current:less than equal 60mA Working Temperature: -30 to +75; Storage Temperature: -40 to +85 Operation: A. This device is work with 12V system only,to indicate the depth appointed.Normally,the buzzer beeps once when it was connected correctly then turn on the power B. Keypad Mode: Quick the keypad Mode to switch /DP//UN Hold on the keypad Mode to turn on/off the monitor Shortly the keypad"to set the value required Hold on the keypad"to keep the digital increasing/decreasing fluently Parameter: :(Low level alarm) Range:0-0.6-19.9, when the level no more than value() appointed,the symbol flickering and the buzzer beeps all the time If =0 No alarm, alarm setting range is 0.6-19.9 DP(Depth Alarm)Range: 1. Unit"M":0-99 2. Unit"FT":0-199 3. Unit"F":0-49 If the level exceed the a pointed value, the buzzer beeps twice (Keel offset)Range: 1. Unit "M":0-6.0 2. Unit "FT":0-19.9 3. Unit "F":0-3.3 If the value() was appointed,the depth indicated should be deducted by this.That is to say:Indication =Actual depth -appointed value Remark: The digital be flickering where there is not signal or the signal is too weak to read. Indication range:3-199ft,if the depth 19.9,the digital be like "XXX",if less the digital be like "XX.X" Type:BN Color:As shown Material:316 stainless steel Package Contents: 1 x Depth Gauge 1 x Transducer(with Wire) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.