Waterproof voltmeter is good thing for Motorcycle , 4×4 quad. Voltmeter is realy waterproof and stubborn.
We produce it in China but quality is very good. Voltmeter have good accuracy . You can buy this voltmeter in three colors : blue,red, green. Lights up very nicely but under the sun is not seen nothing 🙁 I have to use hand to cover the from sun.
His price is about 3.5 usd or 6 usd (ebay, dealextreme).
Bee Carefull watterproof voltmeter is in two versions first have measuring range from 3.3V-30V and second version of this voltmeter have measuring range 15-120V and not cannot be suitable for car or motocycle with 12V battery.
There is good voltmeter for my car or truck Parameters of voltmeter:
Dimensions: 40 x 25x 25mm
Measure range: DC3-30V (Do not need Power Supply, Measure 3-30V directly )
Maximum input: DC30V
Permissible Error: 1% (+ / – 1 Digit)
Display: three 0.4 “LED digital tube
Display Color: Blue
Refresh rate: about 500mS
Current consumption: about 5-20mA
Operating temperature: -10 °c ~ 65 °c
Voltmeter with Waterproof, Oil Pollution Prevention, Moistureproof, Shockproof, Dust-proof
With Reverse polarity protection