
For example hold function and minimum / maximum level. I use it to test the maximum performance of my homemade pneumatic sirens.

π RISEPRO Decibel Meter, Digital Sound Level Meter 30 β 130 dB Audio Noise Measure Device with Backlight, MAX/MIN, Data Hold, Auto Power Off, and Dual Ranges - HT-80A
6 Review

π Professional Red/Black Digital Handheld Sound Level Meter - Automatically Metered with A and C Frequency Weighting for Musicians and Sound Audio Experts - Battery Operated (9V) - Pyle SPL25
5 Review

π DIMMAIRY Decibel Meter: Accurate Sound Level Measurement 30-130dB with Backlight, MAXMIN & Data Hold
3 Review

π REED Instruments R8050 Sound Level Meter: Type 2, 30-100 & 60-130dB with +/-1.4 dB Accuracy
6 Review

Kapro - 353 Professional Ledge-It Try & Mitre Square - For Leveling And Measuring - Features Stainless Steel Blade, Retractable Ledge, And Etched Ruler Markings - 12 Inch
23 Review

π² Johnson RAS-1B Johnny Square: Professional Aluminum Rafter Square, 7'', Silver - Top Quality with 1 Square
8 Review

β Stainless Steel L-Square, Size 3-Inch x 4-Inch, Zona 37-434
8 Review

π CAMWAY 6 Inch Digital Caliper with LCD Display, Electronic Vernier Caliper, 150mm Stainless Steel Feeler Gauge, Plastic Digital Caliper Set for Zero Setting Inside/Outside Diameter, Depth, and Step Measurement Tool
3 Review