Tape measure of 5m. https://amzn.to/2IiQnMm
Spirit level https://amzn.to/2IiQxTY
Digital Caliber https://amzn.to/2XzUnuy
This tool is of my invention, it is very useful to put the taps of water to the measure and to the suitable level, also serves as a bridge for the verification of the estanqueidad of the facilities.