Buy a Testo 815 Sound Level Meter and receive a FREE Testo 540 Light Meter worth £110

The Testo 815 is a high accuracy sound level meter, measuring to DIN/IEC 60651, Class 2:

• Easy to adjust
• Frequency weighting in accordance with characteristic curve A and C
• Maximum and minimum value memory
• Built-in tripod knuckle screw (1/4 inch)
• Switchable time weighting Fast/Slow

The Testo 540 is a pocket-sized instrument for measuring ambient light conditions:

• Range 0 – 99,999 Lux
• Hold/max/min facility
• Units in lux or footcandles