You can have a try.

Features:
Working method: According to the signal strength to determine the location of the blockage.
S-tronger signal with louder alarming sound.
Equipped with signal indicator, the signal is s-tronger, the red light with higher brightness.
IP67 waterproof probe, this detector can be used to detect wall studs, metal pipes, PVC pipes and even water pipes.
Easy storage, turn counterclockwise to fold the signal wire easily, saving space.
It can accurately locates invisible blockage, clogging inside the pipes and reminds you with a buzzing sound.
Adjustable sensitivity, the receiver can increase the sensing ability to the emitter by adjusting its sensitivity.
Equipped with a USB cable and lithium battery, it is convenient to be charged by computers or c-harge pal.

Specifications:
Name: Pipes Blockage Locating Tool Set
Material: plastics
Color: red + black

Emitter specification:
Scope of application: PVC pipes, plastics pipes, cement pipes, iron pipes, metal pipes
Model: NF-5120(20m), NF-5130(30m), NF-5140(40m) (optional)
Working frequency: 300Hz
Work hours: 10H
Working temperature: 0-40℃
Battery: 3.7V, 2600mAh battery (included)

Receiver specification:
Distance Range: 0-0.6m (Metal pipes); 0-0.15m (Non-metal pipes)
Sensitivity adjust: YES
Working frequency: 300Hz
Work hours: 20H
Battery: 3.7V, 1400mAh battery (included)

Item size:
Receiver: 360 * 65 * 40mm / 14.17 * 2.56 * 1.57in
Emitter: 360 * 300 * 45mm / 14.17 * 11.81 * 1.77in
Package size: 400 * 360 * 75mm / 15.75 * 14.17 * 2.95in
Package weight:
NF-5120(20m): 1755g / 3.87lb
NF-5130(30m): 2400g / 5.29lb
NF-5140(40m): 2500g / 5.51lb

Packing List:
1 * Emitter
1 * Receiver